Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb37ceece0d6b2b…

MALICIOUS

PDF

69.7 KB Created: 2021-02-18 06:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89a64a13ed40454fc70f9f70f85187c9 SHA-1: 978496c91ac91d2106b9d30cdf8c0ae42e49dc54 SHA-256: 7fb37ceece0d6b2b53e2ccd4f5b041b53fb43b9f7a659a7ad032c00400f6f680
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or SEO spam campaign.

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://maypoin.ru/wix?keyword=omron+e5cs-r1kjx+manual
    • http://bejuzoz.iblogger.org/yamla_pagla_deewana_video_song_bestwap.pdf
    • https://nenefifozotuve.weebly.com/uploads/1/3/0/8/130874038/2390775.pdf
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fc60ce89df04.pdf
    • https://cdn-cms.f-static.net/uploads/4408319/normal_5fd7428a346a1.pdf
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd625b2366be.pdf
    • http://xevozunufu.iblogger.org/guru_graha_mantra_in_kannada.pdf
    • https://static.s123-cdn-static.com/uploads/4500904/normal_60017bf08ddcd.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_6018242fa2e5f.pdf
    • http://kataeta.club/nanostation_m2_ap_setup323yh.pdf
    • http://toolsbestpricemicrometer.site/wondershare_filmora_full4odj4.pdf
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fd2ea5827e93.pdf
    • http://hookup756.fun/oxford_picture_dictionary_2nd_edition_free_downloadimo6f.pdf
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/178030.pdf
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fd60b8ba40a2.pdf
    • https://cdn-cms.f-static.net/uploads/4421627/normal_6026ebaa03730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lususexore.epizy.com/18283451225.pdf
    • http://virilos.epizy.com/buterunelegubagasujewa.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_off0000d570.bin
6104cac2d2258798c56250c042dc3caa4ceb3903d0a84dfba74d0699ef3267cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 5388 bytes
font_01_sfnt_off0000e7c4.bin
52d0ad994710d36a63f96040104a6893ac3735c9d1ecd6183dc312d5c10712f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10032 bytes