Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac01f87ca6e4d6eb…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 06:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 168d65364c14f0709ae2c1b5ffa96502 SHA-1: 75ccd16054350da033f60f6c30efc1d6a118399c SHA-256: ac01f87ca6e4d6ebb598862d07783d198686b549f8cae34f4691028e50e6645d
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. Heuristics indicate it functions as a link farm, embedding numerous URLs pointing to potentially malicious content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=best+friend+quotes+memes
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144b98527da9---82117508380.pdf
    • https://motodubai.com/uploaded_images/files/divukegiwekideribefozo.pdf
    • http://ijiantu.com/filespath/files/20210927041935.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51145585230.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/wupaselumun.pdf
    • http://rooptex.com/uploads/54084459852.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/34787295341.pdf
    • http://chanhungcorp.com/images/uploads/files/67161139200.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/xipimosawuguzosiwesudijok.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/vobagabunukilolilexu.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/56327528569.pdf
    • https://skatrip.com/basefile/skatripcom/files/dorowajoxu.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/funanojubabejabitezu.pdf
    • https://congtydaihai.com/upload/files/fofinoki.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/37231924574.pdf
    • http://pazarziraat.com/userfiles/file/lazeverobopoxowoju.pdf
    • https://felixtrail.com/imagini_ws/32300202385.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/051ecf9f8e83232c2af6023ede609439/73018084979.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/xefutuwukowobomogolef.pdf
    • http://hkalc.com/userfiles/4710927055.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/nifemoxezukopejeparo.pdf
    • http://chochosanencino.com/uploads/files/lopukefazi.pdf
    • https://basealimentare.it/webroot/files/fck_uploads/File/dowipofovemu.pdf
    • http://alrabbancapital.com/file/files/vojuwadasotitewoga.pdf
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/89887662393.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa2.bin
c35c2265fb804a58080c23a0aa9b9917aae00df072d134888bccaebc0cfe9ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA2 15184 bytes
font_01_sfnt_off0000d5e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16792 bytes
font_02_sfnt_off0000edfc.bin
8642ada09c9a5b0e82b46939639104801220b7870bdd6c66855160b7f57011d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 10604 bytes

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