Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae2537bd881e76…

MALICIOUS

PDF

125.7 KB Created: 2021-04-09 23:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b169d33c54970d16fd4a0548537f8c46 SHA-1: aa32879917b5ab1ed0b7d3895d0bc4afd3bdac94 SHA-256: 98ae2537bd881e76f862b323f55fca3b0fa3a9b4ea322551a11bfb05d91fb6d5
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, with one pointing to 'xezojetit.ru', suggesting a phishing or link-farming scheme. The presence of embedded URLs and the PDF structure strongly indicate it's designed to lure users to external, potentially harmful, content.

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.
  • 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://xezojetit.ru/strik?utm_term=voidable+contract+can+be+described+as PDF link annotation
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/munufi_karefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6068322609798.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/lutefufimi_zadoxuzikurid_selerazetuw.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/bba2989.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/xosonazoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_6051e4236d038.pdfIn PDF document text
    • http://xedowoduwonaf.iblogger.org/fadibabajekafoxage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_600ba3315b57b.pdfIn PDF document text
    • https://nijikubu.weebly.com/uploads/1/3/5/3/135347783/b8f8202b57b4bd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_6739c1d5ace94a4a9c58fcaf54142f94.pdf?index=trueIn PDF document text
    • https://b1fdf235-84a1-4479-ba44-7fc4a4f983d7.filesusr.com/ugd/afcd87_d4cb7aee3be3458bba0fc431a8661ee2.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_77e2875ca3854934aee52b2bcbfb7ead.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/wijevud.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_e0824ff1e5854811a4a6f5a2a6ab468e.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_96d815e37ea640d58b5d8f9aebd1759c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/14222867493.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/17422342095.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_c27ea2965b1d487eba0859e6b6598204.pdf?index=trueIn PDF document text
    • http://xezeruv.epizy.com/bosuvefiro.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/mayflower_families_through_five_generations_volume_six_the_stephen_hopkins_family.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_off0001b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B499 5036 bytes
SHA-256: 8699285c199f705cbec3b7fa99ee2c852588c454c2420cbf8fa689a05d44c8dd
font_01_sfnt_off0001c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5C4 10376 bytes
SHA-256: c5a8e4e0f182253f482686a999d7f4d679d46386230d9819ef249754a4a6ce5b