Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeac0e26954a4bfd…

MALICIOUS

PDF

99.6 KB Created: 2021-03-18 21:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea24edcc9106846d73bd62ea387313e SHA-1: 76c33a712859bfc7fd47df5ae75f1591c466ac78 SHA-256: eeac0e26954a4bfded5aeb3283ba089a6f2ac80cc089e4288afd5ac4895136be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-farmed, suggesting a malicious intent to drive traffic or distribute further content. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=sources+of+administrative+law+in+south+africa+pdf
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fcf2d83e0871.pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fe68792a05e2.pdf
    • http://rimiripa.mypressonline.com/nexaki.pdf
    • https://cdn.sqhk.co/penutizufib/gfzKqgi/4607405043.pdf
    • https://cdn-cms.f-static.net/uploads/4483336/normal_601f53a0ad682.pdf
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/4328a448f.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_604b769160073.pdf
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60208ddc53ff0.pdf
    • https://cdn.sqhk.co/setuboluraje/a9Q9KKY/last_podcast_golden_state_killer.pdf
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/eea3589.pdf
    • https://cdn-cms.f-static.net/uploads/4461207/normal_6017413f1cbbc.pdf
    • https://cdn.sqhk.co/vasozaponem/NnieP0Z/traffic_racer_game_download_for_pc_setup.pdf
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ff0441a32cf3.pdf
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ff2230a59f51.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_60215f6683e46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mudurixo/interview_questions_for_administrative_secretary_position.pdf
    • http://vujapoguxesak.myartsonline.com/sexilavatunulun.pdf
    • https://s3.amazonaws.com/davawina/22713644285.pdf
    • http://jupevesu.atwebpages.com/duxikimabozuwuluwomop.pdf
    • https://s3.amazonaws.com/mivokozibu/air_force_pilot_ranks_us.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_off000148e5.bin
eb76f53d235864831537225f42451e91a96bfba696c68a80006f56b341bca2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148E5 5652 bytes
font_01_sfnt_off00015c06.bin
3f643356f24972513fe9c9ebd41d2e44cdc6944fae5bbbef2c4f00cc8faeba74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C06 10760 bytes

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