Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcaa3a14f7a7813…

MALICIOUS

PDF

79.8 KB Created: 2021-04-01 11:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2634cd50879c4538bdf793831e20bc4 SHA-1: 76b65a6b5c0270a083faaa5be7e537feb6819891 SHA-256: 9dcaa3a14f7a78133744b01b47db0f588044f505e9c76e4a6113010a2a2670eb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious sites, potentially for phishing or malware distribution.

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://vilenefex.ru/wix?keyword=trig+star+problem+local+contest+answers+2004
    • http://acupofjacob.com/139462176153izwv.pdf
    • https://cdn.sqhk.co/vomofizog/hjiidig/akira_movie_songs.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_604f058e6bd65.pdf
    • http://ig-copyrightnotice.com/lagu_green_day_basket_case_originale89lo.pdf
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/9a2aa21d09.pdf
    • https://falomomorojed.weebly.com/uploads/1/3/1/4/131438216/4643081.pdf
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/8627437.pdf
    • https://cdn.sqhk.co/posojuvapono/eid5eha/carpentry_training_programs_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4379849/normal_60469cb0d0a27.pdf
    • https://static.s123-cdn-static.com/uploads/4501775/normal_60055a78e8f53.pdf
    • http://teenagetutor.online/rock_and_roll_music_songs_list6ltfv.pdf
    • https://cdn.sqhk.co/fuluzezufe/igVQjaB/ben_10_games_free_apk.pdf
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/3150593.pdf
    • https://cdn.sqhk.co/raserijene/mhisGAx/vonikebezuxafarerukagara.pdf
    • http://zoosalon.org/17568073751rt5gb.pdf
    • https://cdn.sqhk.co/wimiwupo/hbjehaf/20237415244.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_8b718737ea744cde9669e705d021013b.pdf?index=true
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_cde3780db10e43b2b2e260f0cb89a2e5.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_off0000f8f4.bin
cd1858e03b7649cfb0a5cff213831cc9cea2a2e99ed3c572aab00d158fe9d328		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 5796 bytes
font_01_sfnt_off00010cb7.bin
d56d8cfd864ac4447a203da788e48d2bccb8db8a68be6429a22d95ee56f2ef73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 10980 bytes

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