Malicious PDF — malware analysis report

Static analysis result for SHA-256 763a25249a9db7c5…

MALICIOUS

PDF

102.6 KB Created: 2021-03-09 01:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c0e4ddf5f0e07bee2da4f9c1b32027c4 SHA-1: f6e77bcec2fcc662841135960fe38b78e1cd63b0 SHA-256: 763a25249a9db7c533495efea0e685df5fc8252a4fc6e67481831a63503c7ccd
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, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the presence of numerous external URIs points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=author%2527s+purpose+graphic+organizer+pdf PDF link annotation
    • https://jevuzukolusiwu.weebly.com/uploads/1/3/0/7/130739503/xaginelubigerabixigi.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/7353382.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/rerawutivuziko-fuzij-penapatujeriw.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/zaxaliwiji.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/589825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidev.rf.gd/19485108434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee32dec-d195-4504-aeb3-b1142b7aeab5/formato_normas_apa_sexta_edicion_word_descargar.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_b58c675d02cf4688bde3325bee02cc21.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_559d392f34d54407b4d45b59ee9ac117.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/chain_of_custody_report_example.pdfIn PDF document text
    • http://xogamix.rf.gd/john_grisham_the_guardians_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/1280_x_1280_wallpaper.pdfIn PDF document text
    • http://buteboregof.epizy.com/9742857346.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/cds_2_2019_paper.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_ffccd87868744aff9f165f931eb31b50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/18988815275.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_83de365aff5843cca96f685d9d6300c8.pdf?index=trueIn PDF document text
    • http://diwomikutaz.epizy.com/discounted_cash_flow_stock_valuation_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/78081698329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e923931-3a49-4fa3-b9ff-ad0745216123/7916093308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17dc03b-5d86-45c2-8505-be41eb64d04c/jowunavekirijulofuxojej.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_ad9afa8cb203443d95a8fc6838d63906.pdf?index=trueIn PDF document text
    • http://tupusivamiguta.rf.gd/google_voice_assistant_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b1ec8a-43fe-46ad-8644-9fc1fd43ad6c/pufeletukijoxosa.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FC 5456 bytes
SHA-256: ff7e31195b3fdceeed93963756dda5f8b3b5dbeb5fd8607f67152c69e80d53fc
font_01_sfnt_off0001669b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669B 11164 bytes
SHA-256: 47d1dceaf25aa5e5807953b6c1e713f94f8da7be21a725482284f9b0594b25ba