Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e1f1f8bd602771…

MALICIOUS

PDF

71.8 KB Created: 2021-03-10 04:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 91dc69ebb0575b5f9d296f0f3289c614 SHA-1: 91bbdfe10e5f74a1907cacb923133494b0d64e7b SHA-256: d9e1f1f8bd6027711c135345c80c14a71fa9fc92f0043e145d628d7df4210c77
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=btec+level+2+engineering+book+pdf PDF link annotation
    • http://lnstagram-office.com/konsep_amanah_dalam_islamppd7v.pdfIn PDF document text
    • http://petrol-v-pol-price.site/paintball_store_near_me_rancho_cucamongalky03.pdfIn PDF document text
    • http://expo-kit.ru/data_analysis_with_stata_prasad_kotharialuzb.pdfIn PDF document text
    • http://info-pages.ru/3760908159342uqv.pdfIn PDF document text
    • http://micrometer25bill.site/sandeep_maheshwari_new_videov1vaz.pdfIn PDF document text
    • http://mihetos.xyz/what_weapons_can_a_priest_use_wow_classiclbick.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/59910554810.pdfIn PDF document text
    • http://jopkapopka.online/moviledolilepanf75mb.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/vexuxisegexevof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/why_does_my_apple_music_keep_disappearing.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_fd6fe0f181cd45bf9ba82620160d5d64.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_a8da8617317e46299e5dccc068329f6c.pdf?index=trueIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_3e070c2b60434f02bd41265cc1a205c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/bugis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5e3015-1c5d-4597-8278-642a75bed4bc/calculo_diferencial_e_integral_conamat_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/kizokunisumorameko.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_45dc3a40b1cb46478f8fb49493eaa12a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d309932-ddf6-40d4-9c44-2cf0648fd385/9309390217.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/interior_design_govt_colleges_in_delhi.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/basic_english_usage_exercises.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 6452 bytes
SHA-256: 23e8cfde14408656995582c21943eeec0eccc9e5a2f65670b9631e3a4117aa8d
font_01_sfnt_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 5380 bytes
SHA-256: c484f3c5087e6eba40bc49f6057ebd79ab8e7bceac83db1c792959804d865cd6
font_02_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 10272 bytes
SHA-256: d236d3ecad279307efc7e424d30cb221b677cd96b8ec73d6fba22bef8bf56aa9

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