Malicious PDF — malware analysis report

Static analysis result for SHA-256 779e16347f10a71b…

MALICIOUS

PDF

73.9 KB Created: 2020-12-26 20:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4c1b7eb5fbde278e447e762e3ad7df25 SHA-1: bb8677e0a4b15d25b0e381ca1a1cf989a861c052 SHA-256: 779e16347f10a71b4047640c2b900428dda23cd68c3ba16a47914e38471b93d0
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://traffnew.ru/strik?utm_term=crewmate+guide+among+us PDF link annotation
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/7692feadc.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/papule_jijidalozuman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fa6ef2864154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcd3e0cb3fd1.pdfIn PDF document text
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/5753334.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/e066e0c2cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5f950b674599e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_5fbce2dead04e.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/184074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5fc183296d0b3.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/4448308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fc95e9d22e01.pdfIn PDF document text
    • https://vopakumadojaga.weebly.com/uploads/1/3/4/3/134361244/felupozonoxene_kazowonovul_bolibadot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fb76051a9357.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/tagokunaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5112 bytes
SHA-256: d59b71c1d4c6f6d0476302d501692a89560670808ba334bf0f65dd9216af2d94
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10392 bytes
SHA-256: 2138ab2cb9dba69a98c4bb2fade15ae583ac59ad35f66002872cf3dbd113c07b