Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffc0aae51759a77…

MALICIOUS

PDF

103.8 KB Created: 2020-11-13 01:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bebca6cff2473fd8fe718d348aa52e8d SHA-1: 2107c9de4283743bc97629f0f0f9762c29737791 SHA-256: cffc0aae51759a774c31b7e7945e24ddb3bb9ab3791d62578a6c5ccb00add17f
216 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses brand-impersonation credential phishing. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/finuvifoj.pdf.
  • 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://traffine.ru/strik?utm_term=vault+private+equity+career+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5f999bf999773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f92123b1b51e.pdfIn PDF document text
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/finuvifoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f899dc1759b0.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/7cea55df.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/2600911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8abce967d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f99fb0087454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8731997fd5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28c0d6e-3e86-417d-854c-86021215e646/zezixil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c3fa47-faff-4e55-b155-fdcddb5fba48/48879016979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e5defd-5f19-4461-b29a-1078ed7ecd9d/a4_size_paper_border_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7acbf1d-979b-4594-a8f2-189f729a3739/zufipudonuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3e0716-b7d5-409d-9b38-c5ae805afa02/fuzobabud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a95144-6829-43e3-942c-80949d2abab1/31878589341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758a9f88-2a34-4991-8759-228916c72406/isaca_cisa_review_manual_27th_edition.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_off000156af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AF 5316 bytes
SHA-256: bced86bc9534f5e0904e3446dce16321b20881bb2fa8fbdd5b1061ed49bb4d09
font_01_sfnt_off000168db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DB 11580 bytes
SHA-256: 3c277d325527851f231390800fcc9cebf84db9681a41ea212a87dd9753671aa1

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