Malicious PDF — malware analysis report

Static analysis result for SHA-256 246ff5fec66208cc…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 21:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b945f9c60cab3d29dd23c30adcc89bab SHA-1: 5f59baf23846513bef6eee91c2fd30a3fcc5c6c8 SHA-256: 246ff5fec66208cc31fd975dc378387cb1e3c5d8c8bd656d9de8e86b32776fe1
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 point to other PDFs, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=cord+to+connect+android+tablet+to+tv
    • http://badgesverified.com/27830248780k5p14.pdf
    • https://static.s123-cdn-static.com/uploads/4417405/normal_5fe157e35c2f4.pdf
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/riwez-nojogusijube-kefobelimog-ripufixip.pdf
    • https://cdn-cms.f-static.net/uploads/4380692/normal_60176e39cf3f7.pdf
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/6b98ab3612eea5d.pdf
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/7975795.pdf
    • https://cdn-cms.f-static.net/uploads/4478148/normal_6047a33c9f9b5.pdf
    • https://cdn-cms.f-static.net/uploads/4417049/normal_60369714c6b65.pdf
    • http://show-visitor.xyz/what_does_marginalized_population_meanrvz2y.pdf
    • http://matteset-spon.space/241454882727rxmw.pdf
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/9933098.pdf
    • https://static.s123-cdn-static.com/uploads/4527108/normal_600902e7217cf.pdf
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6041cc231c15c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mudurixo/the_magic_flute_opera_summary.pdf
    • https://s3.amazonaws.com/napejaxosinages/personal_trainer_food_diary_template.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_off0000ee40.bin
d0240824d258da348e92598ae7d0f96bfe24f7f05c78bf27a7a98225d0a507c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 4860 bytes
font_01_sfnt_off0000fed4.bin
5876a8cdf40ef8d54176fa81505f5db12e47d0926ef1b1c9dbed87fdbd1f3b5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10564 bytes