Malicious PDF — malware analysis report

Static analysis result for SHA-256 98de8b2ba7da9886…

MALICIOUS

PDF

112.7 KB Created: 2021-04-17 14:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 81bd4260bed3c537b32bb44eb9cc425b SHA-1: bb0b6bd30f33decb2761e8d6242ddf057a8ceff5 SHA-256: 98de8b2ba7da9886e3e545803a7b82647ab1526c6754a9a73455c8c0957e894c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=motorola+xpr+6550+manual PDF link annotation
    • http://zemimumaloger.iblogger.org/akuntansi_dasar_kelas_10_kurikulum_2013.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/dezeku_bituve_tizizovitefufi.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/gfjahbo/should_i_become_a_game_developer.pdfIn PDF document text
    • https://cdn.sqhk.co/nikapeke/ihghhcW/glass_roller_ball_bottles_for_essential_oils.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/ijhf82r/teboruremoxanorubujajew.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/iyElTdk/64073282518.pdfIn PDF document text
    • https://cdn.sqhk.co/tigepukeri/9xjamFQ/champaign_county_ohio_social_security_office.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/11030e18ab4d802.pdfIn PDF document text
    • https://milorupubi.weebly.com/uploads/1/3/4/3/134317418/9505538.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/zixalok_mobumujeparaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://zelawiture.epizy.com/what_is_the_bloody_chamber_based_on.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_68131346fbe049ea8f2cf608d8fa654e.pdf?index=trueIn PDF document text
    • http://waxivapisisan.epizy.com/zemomavet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32179fbf-d901-42bd-bcec-ebf1924cd7b1/fundamentos_del_voleibol_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2b3fd2-9291-49a2-be18-5904238785a4/2005_peterbilt_379_owners_manual.pdfIn PDF document text
    • https://c75ed97e-f406-4d79-b864-c99612e64be8.filesusr.com/ugd/a66d15_a3eedf12b28448bda2e0fef8b47e8452.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/jokiredobureromozi.pdfIn PDF document text
    • http://nasutewu.epizy.com/four_studies_on_the_history_of_central_asia.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_cbd1f25055e54b29868c0e3bf1e5385c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/mipinonanujidixum.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/apa_informed_consent_form_template.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_b5fc9783075a4e49b569fb589d4b2700.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb96eef-8b09-4816-92b2-3249d268bdb9/15612832846.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/22558735697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b6fa50-769a-41ba-b392-f97a280e1122/225129633.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/vurumasurifodatemexogatin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 6704 bytes
SHA-256: 3df4d54c949f7679b55d8cfdd3c4355cc1ad748ba4ee4f77bc36b99830bd1442
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 5444 bytes
SHA-256: fd82fde30c96d177839ecd3ccacf6571af28dadc37805c7e48bf94e3ee55cdba
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 5280 bytes
SHA-256: 72bcc4e82ccef3935df1854369a1e3f3e039914041021666ef5d37247e67ae8b
font_03_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 20952 bytes
SHA-256: 9f938b4a98a0b458a4f048d765a0ceac8b10773d56ff4003ac6f88f00ab07485
font_04_sfnt_off0001594b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 15892 bytes
SHA-256: d3ab714c02223184ccea60f100703aaf6f16417deb377f62da8e83d87578afd2
font_05_sfnt_off00018c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C88 16756 bytes
SHA-256: 02d3c3e76908c7a34d76b9c0a07c762985900edb9b34c0a5c3a2e7ef031518d5
font_06_sfnt_off0001a43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A43A 6108 bytes
SHA-256: d1e5b9a6787baa86606c5ac8d28f8c93854d60ca90c4d70f489a89f841449794

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