Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef802d4552c22f5…

MALICIOUS

PDF

76.9 KB Created: 2021-03-08 13:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cc9daedea88d734db32500cbeddd2d2 SHA-1: a05ed7b5ba4bdae9b0f27ca2057aad3da90b4390 SHA-256: 7ef802d4552c22f581f2a99f8c3d0d2ffb37bcae0b80c01fe9bd378d587ffe5e
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/123?utm_term=aristoteles+metafisica+pdf
    • https://cdn-cms.f-static.net/uploads/4377935/normal_601aa7d2c7757.pdf
    • https://cdn-cms.f-static.net/uploads/4501645/normal_601ad3fe8beb5.pdf
    • https://cdn-cms.f-static.net/uploads/4393628/normal_6023169a33243.pdf
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5fddd01c0fc26.pdf
    • https://cdn-cms.f-static.net/uploads/4478926/normal_60194f7c12761.pdf
    • https://cdn.sqhk.co/gebitasixa/aPsmJhg/14308089619.pdf
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5fdafd54c456b.pdf
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fdc3641c80ba.pdf
    • https://cdn.sqhk.co/nuzitomizaj/fX4icjj/39022863927.pdf
    • https://cdn-cms.f-static.net/uploads/4470977/normal_602d83201adfc.pdf
    • https://cdn-cms.f-static.net/uploads/4369793/normal_602954130a852.pdf
    • https://cdn.sqhk.co/vibisidumes/d9hIjed/smart_pulse_switch.pdf
    • https://cdn-cms.f-static.net/uploads/4404959/normal_603bb19151baa.pdf
    • https://cdn-cms.f-static.net/uploads/4481417/normal_604122d0cb166.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd68682b5928.pdf
    • https://static.s123-cdn-static.com/uploads/4459914/normal_5ff0d85b76317.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xonobijikivo/logo_quiz_answers_level_64.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_8bc9b6b5f0794040ab841297a7b45b50.pdf?index=true
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_4fc2245e351042c6b4dac0c3359186d6.pdf?index=true
    • https://s3.amazonaws.com/dotivaf/fallout_4_companion_guide_nick_valentine.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_4037100e9c364d7a8fdfcd790ea71aaa.pdf?index=true
    • https://s3.amazonaws.com/xeponodij/nabinomes.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_off0000eedc.bin
3155a81a7cfaf36d51f8ed428784a23a3a64dfedf03860923d28e7efc89c6d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5288 bytes
font_01_sfnt_off000100bd.bin
fc9d6e409b66d5c552034891238937ee2754e65a9c0ea9331620bee65eb6c4d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 11528 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.