Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acc0ffc64ca6de1…

MALICIOUS

PDF

78.7 KB Created: 2021-10-17 22:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 002b873560a56b30eee2a1c3a1f9a4ee SHA-1: 6d0d6052d363e462baae19c2633bdcc6ceb8600b SHA-256: 2acc0ffc64ca6de1f302d0b0c62d60f22f42363c5d210d42cd42ece5c23f2b95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs hosted on disposable domains, suggesting an attempt to direct users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://garglob.ru/uplcv?utm_term=the+politics+of+conversion+christopher+clark PDF link annotation
    • https://dursunguney.com/userfiles/files/57927553732.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/xovugabinun.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/sopiwerutaparotapukemogap.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16159747ade09d---piditosasibemibogezir.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/sumesogitojametemaro.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/38585286021.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/39170217625.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/mujegolulokinulubixata.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092807504073499.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/xotaxonamazifubigopu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907140320554442.pdfIn PDF document text
    • http://synphabase.ch/upload/file/16570493253.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92662762516.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/gizumegusetetovuju.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/87547456801.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/teximemakibafarumikajo.pdfIn PDF document text
    • https://labelmarket.pl/data/file/xatelavapagubi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/75778823194.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165ce0cb02ea---98186376521.pdfIn PDF document text
    • http://aa-nusd.jp/43959551756.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vanugodasinofab.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/jedojijevasefoxofu.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/dumofadonurawezatimigom.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10700 bytes
SHA-256: b10cb00d7dc961bde572cf767a55dee96435d059554fc3257e4a2ae562dbe7f7
font_02_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 17368 bytes
SHA-256: c8ed5e067545d2abcb10a35cfa78a1f1bb93d65dbf86fb84b4216b7d474c29d7

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