Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fa59a762ede57f…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 02:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7e9dcaa65908fcff38ac37e4f5dd2e06 SHA-1: 96bcdb77e68dbe63da1aaeb895a60fbb87faa09e SHA-256: c9fa59a762ede57ffdde93e49bce34d081ef7c138212df7889ee3b4211df703f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content, such as the 'grand theft auto gta 5 apk download' lure. The presence of a 'download button' heuristic further supports the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=grand+theft+auto+gta+5+apk+download PDF link annotation
    • https://cdn.sqhk.co/gasubapo/6bhg5ib/4891404276.pdfIn PDF document text
    • http://logemopi.22web.org/40411212032.pdfIn PDF document text
    • http://dovogonusiru.iblogger.org/metoxulimoxikonidunaxexeb.pdfIn PDF document text
    • http://vefefex.iblogger.org/wesak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_603ef14358bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368218/normal_5fe3ab8f1e927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd8535a38f1f.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/jPgnjcU/girly_ice_cream_truck_car_wash.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600bca48dcd0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_2ad046291e3042c59c503397b069840d.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_04b89186b55142d094f0bced5476dcbe.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_6044d6e99454417f887f60a636b5ffff.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_57d5c4e482cd4031b44ea6ce8966c494.pdf?index=trueIn PDF document text
    • http://vufiferej.epizy.com/estilos_de_aprendizaje_visual_auditivo_y_kinestesico.pdfIn PDF document text
    • http://surotatifezuxe.rf.gd/dell_support_windows.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_79dcbba38269492687e8378382c5bc55.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_65d808673cc9482791c2960f507ac3ab.pdf?index=trueIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_e4947f3e45e9424cabd737d0664dbd6e.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_7d016c9e027548128cf6d33206ab8dc9.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_29eec2c31a1f411a838fb89d2e66f272.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_dfda4824082341aeaf0f0f7e45dc4770.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5436 bytes
SHA-256: cbd5cfdf8ae4437cfa475635e95251e504aa3356c2cb45fc7178fa161498eb79
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11168 bytes
SHA-256: 84045da1ee9ab1f8ae5077676bc8558648f454fcea890d3397b3a3443d741ce7

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