Malicious PDF — malware analysis report

Static analysis result for SHA-256 0310cf251d50fa9c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-29 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ac3aebfa2cc92201d23c35b9a156e45 SHA-1: b41891ef19def3b547fbe0166e6b8432edc1fd22 SHA-256: 0310cf251d50fa9c4fca3bde4aba133fefbdddc786567fc1aeec039c78976363
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

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://baarspo.ru/award?keyword=bonos+de+carbono+mexico+pdf PDF link annotation
    • http://vebuwovivulab.mygamesonline.org/africa_country_map.pdfIn PDF document text
    • http://leledup.mypressonline.com/lemefumokizuwiseli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_603bec5bdf0e4.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/coca_cola_advertising_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_6057999334af6.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/jspdf_autotable_line_break_not_working.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/ramas_de_la_arteria_carotida_externa.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/aRgcOfg/63180609332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fda831fe3c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_600d62e50a8da.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/sulis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_605f9be46aa16.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/agrometeorologia_agricola.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/Niejchj/nike_flip_flops_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/bgghzUh/45416517843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_604da4351fe62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/tegeve.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/34439519477.pdfIn PDF document text
    • http://dubanexotokegel.myartsonline.com/vozifekonekagisuwojedub.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/22868494941.pdfIn PDF document text
    • http://xejawaji.myartsonline.com/50072972789.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 5528 bytes
SHA-256: 93595d43afbd2e5d28b92ef27af87f4989ca7d892b294bc54a358726e1f3ff33
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 10776 bytes
SHA-256: 554823c8fb6d52bfc4281aa1a028197de2b690861248832b3ba7d878bbf451d1

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