Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f19835fe1cfb06…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 15:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 448837ffd36ed1fdf20ef46228bd84fb SHA-1: 4be71944b67ff8057c2ebb9c9a6eb1bf4250c7e6 SHA-256: 05f19835fe1cfb06a64b959749628bea2fb59f6e629711f7e5a3d31fddf18605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=happy+mod+gta+san+andreas PDF link annotation
    • http://atreve.eu/ubezpiecz/obrazy/file/52162991256.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/43890933147.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/73229480736.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/17924739637.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/17373225307.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///48267766923.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/39841808086.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/1935145734.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/48740344022.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/257b6bd7383ade81b1c8116c2f71edd8/luxelekeforizije.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/rijebijagenofulivupo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4044798bd1f5c165e1983ece4f66173c/ledajutol.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/vuvuzigemibe.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/37544407548.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/jijixadevela.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/40467182279.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/82768533644.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/9841208551.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/95336259456.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/5355268791.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/42105954043.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/lebisavojifikidelinuzuf.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_off0000ad1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 10700 bytes
SHA-256: 4b102582979a455f2cb645b826ffe3a59a04c2c4840d73c53eacd5b3a12778fa
font_02_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16864 bytes
SHA-256: a4ff9174ac0b45fadbc18838990d70b8dd77418535e5fe491b1c420b93ee4bf9