Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5680f54e11c870…

MALICIOUS

PDF

70.7 KB Created: 2021-06-14 04:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3f3fdc4b1d4b4f07496049c9f1d5e24e SHA-1: c8ccc4dc7a65fcb7ea189fd6dd421436f3372d0c SHA-256: 3a5680f54e11c870d583e60baa0c785d9ef20cc0e3f6d01630483045548b2669
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a significant number of links, suggesting an attempt to direct users to potentially malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://archism.ru/pbw?utm_term=the+fourth+closet+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365549/normal_602d02c358490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fe12e1463303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_60506b865bf8f.pdfIn PDF document text
    • https://numibogag.weebly.com/uploads/1/3/4/3/134323011/ce7bcf0.pdfIn PDF document text
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/nelakiwemitoka_suginuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6028b853ad8f3.pdfIn PDF document text
    • https://bagonapibuvuxo.weebly.com/uploads/1/3/0/7/130738628/toruworetimidofod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_606317fccc0a9.pdfIn PDF document text
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/3a8459f8c87f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_600da0b2e0179.pdfIn PDF document text
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/4531225.pdfIn PDF document text
    • https://lexeparuma.weebly.com/uploads/1/3/1/3/131380616/befijadonuvituz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5fcf3f66caef6.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/tujimimolakuvoporiga.pdfIn PDF document text
    • https://dipojujepu.weebly.com/uploads/1/3/4/5/134526160/713599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_60255dae20fa2.pdfIn PDF document text
    • https://lapifebe.weebly.com/uploads/1/3/2/6/132695874/kezox.pdfIn PDF document text
    • https://nedisixikimu.weebly.com/uploads/1/3/7/5/137511189/c6540a97039e714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458854/normal_5ff84ca0b034d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_60089c954d8b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_5fd2e15c2b946.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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 4916 bytes
SHA-256: ff0309f4b6fbf14fa35998798df5c23a9e88a40860989c47480fc5b643ea7208
font_01_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10036 bytes
SHA-256: 53c9860c4ffdaed85a371504fac48047dee30c4d212ac28055a0da754fb78a7d