Malicious PDF — malware analysis report

Static analysis result for SHA-256 3387921734d3c90b…

MALICIOUS

PDF

75.9 KB Created: 2021-06-08 19:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efdee1f2bdff57b4e18120a4abd07d2c SHA-1: c0dfebde4170f58bb75add2f615d27ef0861ba3b SHA-256: 3387921734d3c90b06af884e22c3fe5af4116f8a9d8117cb527d25df60442572
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/pbw?utm_term=star+music+tag+editor+app
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ffaa29d5e218.pdf
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/5606152.pdf
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/lupajo.pdf
    • https://kobosarajuxinit.weebly.com/uploads/1/3/0/9/130969632/puxujawinarodus.pdf
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/mojokim.pdf
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/dulijaxisiruvid-pafuzozim-jesejajudixib-zudidokaw.pdf
    • https://static.s123-cdn-static.com/uploads/4375886/normal_5fff5ebec8b1e.pdf
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/96135.pdf
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/ddec8fb97.pdf
    • https://fexemefamerera.weebly.com/uploads/1/3/4/2/134236105/regitelava.pdf
    • https://gaginavo.weebly.com/uploads/1/3/7/5/137517333/kitofo-wapazeguju-nuvezovavu.pdf
    • https://cdn-cms.f-static.net/uploads/4410000/normal_600eb18585e59.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_601f99c25e2e2.pdf
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5fc7fcfe28ffc.pdf
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014d79a43de5.pdf
    • https://cdn-cms.f-static.net/uploads/4420775/normal_601a1c94104e1.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_603448187f08e.pdf
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5fcd1a0096a73.pdf
    • https://cdn-cms.f-static.net/uploads/4469103/normal_6023010352354.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fd19d0ea3dbc.pdf
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5ff25edb49bd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144652854/mobile_odin_pro_apk_free_download.pdf
    • http://wuvebag.pbworks.com/f/samsung_galaxy_tab_10.1_ce0168_specs.pdf
    • http://pidexuxok.pbworks.com/f/xujezokadiregig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec33.bin
f46d9305d1159802eb8036d61f2956cff4e575bb61d309eb59dcf014666f29d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 5464 bytes
font_01_sfnt_off0000feb4.bin
1509ebd635e365458fcbc5553fde81de5e6918fe327910e1cf3775fcc9190678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 10464 bytes

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