Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f16c540e6973c2d…

MALICIOUS

PDF

76.5 KB Created: 2020-11-22 15:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e419df1a80f6001d3036af468e4334cb SHA-1: dc15eaa28bd333dd73985123397f33501797e392 SHA-256: 4f16c540e6973c2df6616e4dfbfdf288c193bf1c7196a2b48536fa5506d778a5
274 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/linuxobogo.pdf.
  • 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://traffmen.ru/123?utm_term=columbiana+power+meet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5fb56d6fa0557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8b0c7f30404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f9f0807388f5.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/linuxobogo.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/5340594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f9c94008c83c.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/fezer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_5fad2faf350ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870bbc02871.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/da2d140d-496c-4ea3-92c6-ed550b6b2adb/27183856934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc60d8f-35af-4bdd-838d-cef7bfea6c73/wesewabuxesedomexuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f23603-f9c1-4a83-a1e8-ce1437a29704/pawasenez.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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 4924 bytes
SHA-256: 1cf344b754e263e43241de204287e0e18b1c1fe1cfa6701bb4b884fabfe60879
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10968 bytes
SHA-256: 5ecae458c78ce5cfb54a2f751454f663dbac832894161c060fda093b8c5cb5e1

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