Malicious PDF — malware analysis report

Static analysis result for SHA-256 40568b42006470ae…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f2698039894f2da31c37151a2eca4bb SHA-1: ace76c89e8407055794b5d62881df94846c0dd51 SHA-256: 40568b42006470aebc168e6802d60eddd8fd129ed34a554a2ae3a7a50e1af863
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with a high concentration of external URIs. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://asfalon.com/__files/file/dadogojibimajivugebisevik.pdf In PDF document text
    • http://lscapital.it/images/file/11526590891.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/67165078498.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/13508985057.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/50083148306.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/pisenevelaborekedepuzox.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/buluzafefopowukenexarizip.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/84373798216.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/pejexuwarugikalifagesafe.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/mogemaxizetevujizugoludu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9daf301c965f6259bde6c0f73f06ee1d/76018507260.pdfIn PDF document text
    • https://medius.sk/userfiles/file/19431385028.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/064abda1302777a51efd0b85d6c84578/zulemekorosajajakex.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tijuxugoxojiseguk.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/3316388948.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///21141059080.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/dajifevoviga.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/gikudorupinixoj.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/3190150510.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/70663612631.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/37054461396.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/62962376954.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gafipixodarubu.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/zuposako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+art+of+communication+is+the+language+of+leadershipPDF link annotation
    • 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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 15608 bytes
SHA-256: cfd57a0c44c3dd2b838eb45f3b80d38912a69894fa5b283bfe8f1abca321c9ab
font_01_sfnt_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 11132 bytes
SHA-256: 3d2815490642c2fa72f3cd4dc133867b3ef6bf1b1dedbe204733ed6eb5f39a8a