Malicious PDF — malware analysis report

Static analysis result for SHA-256 4738deea2ccd60f8…

MALICIOUS

PDF

78.0 KB Created: 2021-03-30 20:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60c1227daaeb6f547d794247b723cf77 SHA-1: 7e5077470d6fd6f3182fcd67200f4954d7f33fb5 SHA-256: 4738deea2ccd60f870d44a3b617a817200dbab5631bdbc3fc601be72121c04d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on file-sharing services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=automobile+bill+of+sale+template+nc
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/94c0dc82be995.pdf
    • http://umniashka.ru/33558595424vtim4.pdf
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/depobimur.pdf
    • http://igoscandinavia.com/how_to_load_paper_into_canon_p170-dhrni2l.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/rosut.pdf
    • https://cdn-cms.f-static.net/uploads/4496580/normal_6024689723388.pdf
    • https://cdn-cms.f-static.net/uploads/4448995/normal_60471957a73ed.pdf
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/limonigob.pdf
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/9263040.pdf
    • http://openplafond.xyz/vapomadikegatil1hzb.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://cdn-cms.f-static.net/uploads/4376374/normal_601217592f7ce.pdf
    • http://fragcups.com/34097686019lkkmh.pdf
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/poseje.pdf
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ff7637b78600.pdf
    • http://lotto-investclub.com/wakanawidafolim8o5ol.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_53937e01bcda4020b759d92c8573c5b2.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_fdf0c84200974e78b03961ba039a93a3.pdf?index=true
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_174321f3b8d84510bc27df5c3ad8a506.pdf?index=true
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_c8312f3c1fb4458e9fed492086729a59.pdf?index=true
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_e2093c6cbe8e4e8e902e4e5ff57c64bc.pdf?index=true
    • 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_off0000f320.bin
028757848e2f350ae6551f6706faf8c58572d5609dae3cd3e70202e5ede2bb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 5196 bytes
font_01_sfnt_off000104be.bin
92ddc9d79b7b8bdf334432f4713635e374802cf89ef4a24242c64b8a79b4081f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10456 bytes

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