Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b937a021c65addd…

MALICIOUS

PDF

66.9 KB Created: 2021-03-20 12:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6655ddd134e3ed260f7800df8ef86d8d SHA-1: 41ea0aed953be59fc7c994e52f36f648f6e771df SHA-256: 2b937a021c65addd1b232e5fe2ec8c5920c446017c03cb3ec98a483334edda48
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a phishing site disguised as a document about cancer research. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=consenso+mexicano+de+cancer+de+mama+2020+pdf PDF link annotation
    • http://rujewazaxijaza.sportsontheweb.net/azolla_cultivation_in_kannada.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/63477815562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5ff64faec997a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_601691a80dbfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5feff845addb2.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/43717165409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_604a30dd5dcc5.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/heart_of_darkness_quotations_explained.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_600d0408f0768.pdfIn PDF document text
    • http://vopukisavenif.medianewsonline.com/10383132160.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/mass_of_light_lenten_gospel_acclamation.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/pegasigefadopezoj.pdfIn PDF document text
    • http://gomidem.22web.org/12696877670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_60413f6caadbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakiserinipo.epizy.com/14843028621.pdfIn PDF document text
    • http://bitines.myartsonline.com/rapijafogazafunulareti.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/zapagefipekubozorawidiru.pdfIn PDF document text
    • http://bewexopol.rf.gd/online_train_reservation_form.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/duvebimotufojawuwobufe.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/attendance_register.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_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 5516 bytes
SHA-256: d5ae809f00785b1753d426e153d1633a4df7f44b857b1b4c0c82ae25dfa8fe34
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 11268 bytes
SHA-256: ece270d6fd20dec353f0383daeb5fe7a427e864bb8f886f7822e09a428dfc7a3

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