Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a618b17185234cf…

MALICIOUS

PDF

81.5 KB Created: 2021-03-11 16:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fa95015cafb80468bf2fd95d6e84165 SHA-1: e03af0e17ef7e2e20cd2bf5d4a35902eb9ad754d SHA-256: 4a618b17185234cf9cc6a7760bc608c4c4f5385a8445f087b78d80faf2cf1393
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 pointing to other PDF files, indicative of a link farm. The primary URL suggests a lure related to downloading a catalogue, which is a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/award?keyword=telecharger+catalogue+oriflame+septembre+2020+pdf
    • https://static.s123-cdn-static.com/uploads/4471710/normal_5fe246e0eceaa.pdf
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fd0f032acab5.pdf
    • https://cdn-cms.f-static.net/uploads/4420934/normal_60433880142c6.pdf
    • https://cdn.sqhk.co/tamejenonisi/zgifhgi/lunar_battlegrounds_ghost.pdf
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff508435524c.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5fd8c2efa0068.pdf
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd27b5809be1.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_603c395769d95.pdf
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/8723412.pdf
    • https://static.s123-cdn-static.com/uploads/4368225/normal_60092acb2ed9c.pdf
    • https://cdn.sqhk.co/gawagunikuw/pgGOhbv/limbo_prime_build_brozime.pdf
    • https://cdn.sqhk.co/jumupebuvi/ijZjhjX/zelle_limit_per_day_citibank.pdf
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/sijibituxipukudikog.pdf
    • https://cdn-cms.f-static.net/uploads/4485434/normal_601470daa4dae.pdf
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/6709583.pdf
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6033df7035580.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6014e9ae8cf9d.pdf
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5ff9353311e28.pdf
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601c5b84074fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gajabedafot/vatafigipa.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/nugetubi.pdf
    • https://s3.amazonaws.com/zunaporam/addington_school_uniform.pdf
    • https://s3.amazonaws.com/patilawasu/melotaz.pdf
    • https://s3.amazonaws.com/nerugiraxura/why_does_my_thread_keep_bunching_up.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83d.bin
4492d6c9ab6059691389721e6a15d98607eda5e0cb8df80588b650a57185f8d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 5932 bytes
font_01_sfnt_off00010c36.bin
d4029580fc36bb2f37a3f935ce416d0a3072ed68975502408c3ce52cef38fae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 1600 bytes
font_02_sfnt_off00011462.bin
1381baf8913495c97f8321d9152a6cccd08e33a14c1fcd53372e46faa1570204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 10272 bytes

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