Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf07c030331e8ec…

MALICIOUS

PDF

68.6 KB Created: 2020-12-05 05:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f7a8f3432f735b250d26e1ffaf951768 SHA-1: 90ca406b8f03b274587f02e34b89bff7287e7900 SHA-256: eaf07c030331e8ec5e9f0ee862f620017ac79319986a0042e63749d09e3b29a2
286 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing and a fake browser/software-install lure. 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 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/suwuzezepew_xivif.pdf.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffi.ru/123?utm_term=the+lion+king+2020+google+docs PDF link annotation
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/suwuzezepew_xivif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5fc186c872770.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/pimavo_nebixatipebad.pdfIn PDF document text
    • https://ribobuwatefinu.weebly.com/uploads/1/3/4/4/134469587/rezukowidebotoj.pdfIn PDF document text
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/taguxajix.pdfIn PDF document text
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/9d7b798a876.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/gazitakoxon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfff689955c744b536924c/t/5fc1645e9ee0f32b87873e44/1606509662154/pokemon_sword_and_shield_strategy_guide_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7932bbb2-4244-4e0b-9acf-483de6f0db30/43011072114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ad1c64-f698-4c52-9d45-737936e0a1a0/apk_mod_tools_vip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6092e537a05ef08bc6e/t/5fcaeb9ba0b42e35669da94e/1607134108165/24425973535.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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 5180 bytes
SHA-256: 3cc0d51d23cec862fb4fffe3c4e08b30448a69d6b27d4f535aca82bf048d8f75
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10928 bytes
SHA-256: 37f9067c682173bd5351c457fd7a430b0d809eab938023789223dd2f22092500

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