Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af54e13bf381ece…

MALICIOUS

PDF

76.6 KB Created: 2021-04-15 01:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14fe6befdd78d0d77c46d6bd1665d71 SHA-1: b3f10d344ec32a37367810f9f3f745e93f098034 SHA-256: 3af54e13bf381ecec9448a806ca961abd2fecf87a819ba823efcf94166a76d65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm designed to obscure the primary malicious URL. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=imagen+de+caritas+emociones, which is likely used to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=imagen+de+caritas+emociones
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/8455118.pdf
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/sobomebeniguwiwimop.pdf
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/juxodajalowijox-jokoselutozaf-befotu.pdf
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/806fc714d15.pdf
    • https://cdn.sqhk.co/moxibusas/jg8ibI9/star_wars_galaxy_of_heroes_hack_tool_download.pdf
    • https://cdn.sqhk.co/wixakulu/ifUges7/62809725649.pdf
    • https://cdn-cms.f-static.net/uploads/4410954/normal_602798b235820.pdf
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/sekafepolipori-tofaguzaga.pdf
    • https://cdn-cms.f-static.net/uploads/4365655/normal_6021beeee1658.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vunizi/74121244074.pdf
    • https://s3.amazonaws.com/baxunaf/blue_background_image.pdf
    • https://s3.amazonaws.com/pavujiniz/sazinoboramijotabu.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_11404f71949646709ad8d1ba094ea09b.pdf?index=true
    • https://s3.amazonaws.com/kodipopujufipig/samsung_tu7000_65_walmart.pdf
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_ba5b9ce2c6454c208d23297697539b4d.pdf?index=true
    • https://s3.amazonaws.com/wisuw/kidakuwuzazowid.pdf
    • https://s3.amazonaws.com/punagilelabon/99652641183.pdf
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_a66081a6964f48068626cc15d92a2655.pdf?index=true
    • https://s3.amazonaws.com/kufazete/ardaas_karaan_full_movie_free_online.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_a48630ca2d1d4f0896952f63b4d86bdd.pdf?index=true
    • https://s3.amazonaws.com/xewamejixolefaj/libertango_string_quartet_sheet_music.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_off0000ef92.bin
f1bb2da2ae4ba58280d0e0b82ce5f531f387db9c2cd8781cdb17f12695ff0704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5164 bytes
font_01_sfnt_off00010103.bin
8462207c2ed948f1dd65ea8f087845fb7abd4e1d2af20acdc6e4700a67f99962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10720 bytes

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