Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffff05ab049e1134…

MALICIOUS

PDF

73.0 KB Created: 2021-02-12 08:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1949fe891d05b6d649038f27c23260f3 SHA-1: 262e324490582852ebfdc2ea5d2ef01f0845acb5 SHA-256: ffff05ab049e11346cdf78024ac07fcdbdbd6a75fd304a7decfa4d9858e3884d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=integral+of+e%255Ex%255E3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417531/normal_5fcbd76d6bd5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498801/normal_5ffc2ef08878c.pdfIn PDF document text
    • https://tufakuxumiwe.weebly.com/uploads/1/3/1/4/131454237/wupabokedoxexaneded.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/18566705459.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/wajunodazuvig-tufelakuras-jopoxawope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fe0f4211731a.pdfIn PDF document text
    • https://tumopododekup.weebly.com/uploads/1/3/2/6/132696021/5505985.pdfIn PDF document text
    • https://zikowipon.weebly.com/uploads/1/3/5/3/135300096/jewenagepitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fe1cbffb968c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416938/normal_60063f400480f.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/numalidit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_6009a4fbb799b.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/fe16449a.pdfIn PDF document text
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/vujibew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_6016c48a6ca90.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/sepegiwo.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/pisawiwofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zarusorujot.epizy.com/the_ballad_of_buster_scruggs_parents_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 4716 bytes
SHA-256: c6e81a9478fe0e6662bb1a525adcb2c2c9319b5ed33d0dd25056c00a8819950d
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 12428 bytes
SHA-256: fe053937839f40ef08eefa91ca4eb912deb760e613ae339770ec9a12c7b08c59
font_02_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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