Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9091866de275c1…

MALICIOUS

PDF

79.7 KB Created: 2021-03-24 15:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 88d1a0ef8e0ffa938528b522fbc225ce SHA-1: b6e1b3e078f29700dc868d8d9dba0a7ae24de4d5 SHA-256: 8b9091866de275c144effc282047a8cb5b9ba62dd667f29e0159a51975f215d2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a theme related to economic liberalism and PDF documents, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://zajinet.ru/award?keyword=el+liberalismo+economico+pdf PDF link annotation
    • http://discount50.pro/418473012517gz71.pdfIn PDF document text
    • http://cleaner360.shop/95183364016sa855.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/2003_dodge_durango_electrical_problems.pdfIn PDF document text
    • http://olymptrade.buzz/91077113288w4sst.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/IgjihE6/nba_jam_by_ea_sports_apk.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/gixipufafuralo.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/how_fix_a_dishwasher_that_will_not_drain.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/jcdpIgi/biluwara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://benamow.myartsonline.com/heart_disease_caused_by_stress.pdfIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_2089cc0b82f348a983730c92689073e9.pdf?index=trueIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/20736914677.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/tisowakatatoligesadi.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/bawevemojugerefomugil.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_b78326e362e14bc3a8ba3e2f1ddc75bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/zuzaravorefebiw.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_95790c550aa54eca8db039f91f9b550b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/muscle_gain_workout_plan_at_home.pdfIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_416d694ef6ca4a78a1be80daed13090a.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_22ca619719384a41b9b9557246b095a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/wifaxepax.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5104 bytes
SHA-256: cf95c9036e1d5d5ac960368093dafbfc050da0e36f6762d987f31a32648b5ea0
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 11704 bytes
SHA-256: afa9e9025759de877d1521c6c9c6afe755a16a658095bd3eb6a4d45fc85779bc
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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