Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e01c7a72765d42e…

MALICIOUS

PDF

94.4 KB Created: 2021-04-14 14:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f8c65aeaecb70f3c08fd6e41df725e5f SHA-1: 60ece763a869592ffe33bd944ae0f4ae10513ae4 SHA-256: 7e01c7a72765d42e29900c2b0c74042f4257057a453f0d36096762fb299144a5
186 Risk Score

Malware Insights

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

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 0.9998

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://mezovuduw.ru/strik?utm_term=maxtor+one+touch+2+300gb+power+supply PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476595/normal_5fc6ccb28abb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_6024a2bdb307a.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jFjgBUj/study_tips_for_college_students_with_learning_disabilities.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/gjigicc/72116600601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5ffa81ac7d508.pdfIn PDF document text
    • https://cdn.sqhk.co/xupebasolaw/eEhfoJB/avery_5161_template_google_docs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_601501c3ad963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_5fda358ae8396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5fdb36aa8edc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_602230248e80e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415070/normal_5ffa5d72f16e4.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ejjEgdH/java_jsp_servlet_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/geepmzv/notikojulirebunazuluri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_9ac23754fb254df7b84f2d4ad034e9cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/tumamefanejaxixudurog.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_3b65099a5fe7474f99a14600b524565f.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_7647274e652e47a5a5767c33ef80870e.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_b2b47fa53ca34b41ab0fc5d9d2460e31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/94508925913.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/82279107245.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_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 6040 bytes
SHA-256: 1ef5df890074243868ac7cde1551a10ab655b32e5692b1353c36cb9eeebd6bef
font_01_sfnt_off00014330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14330 12192 bytes
SHA-256: d62304e4d45e77c48aab51cb65beb9cefffcfa7be4883222c30f7823afbcefd1