Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6b59658e1ca2c7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 02:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2072fd09b8c4c5a026a6355f9139e932 SHA-1: 60f3adb99988b09694b163695abd955f50ad635d SHA-256: af6b59658e1ca2c701ef511900b41fb5a01e428348e12d1b555cdedd7c34879a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=daily+use+english+sentences+in+school+pdf PDF link annotation
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/9bdbf16.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/vokotidudotux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5fd083cb55236.pdfIn PDF document text
    • https://gazufasuro.weebly.com/uploads/1/3/4/4/134482956/19e24a00640d6b6.pdfIn PDF document text
    • https://gukejokofa.weebly.com/uploads/1/3/0/7/130739315/3549053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_6043c1a641a16.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/duguw_nuwujem_newenu.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/nonibasuzo.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/gabuxise-ludilobefemeni.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/fadujemaginewop.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/vogarepiresov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_60236cdae7b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fe758800d0c3.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/c7ddee7998a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417325/normal_5ff924408474e.pdfIn PDF document text
    • https://tumovapexawezan.weebly.com/uploads/1/3/1/3/131398362/zuvurewebeza.pdfIn PDF document text
    • https://rukewopesix.weebly.com/uploads/1/3/4/2/134266340/687490.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/lelikozipax.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/bolusuzego.pdfIn PDF document text
    • https://webijizili.weebly.com/uploads/1/3/4/6/134609257/mosaj-xugadefileb-numatolomew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/fegejesirokasalagawewe.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/software_functional_specification_template.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/tujikoxoju.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/71343142635.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5424 bytes
SHA-256: 4535375973e67e1bf3eaffa1a7bad663be863de5831f44a84e480e79bd9c865c
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 11280 bytes
SHA-256: 8c1419c0f7389ba80aebb5a970b4f45c72ea2a264f3fb88bb73b69f849ede9da