Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41b113d28fcc0bc…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a550ec90754ca7bbdb7dc75c78bf081 SHA-1: 7db1d88d19b340080fad62499b393d6ec1e03118 SHA-256: f41b113d28fcc0bc4d660da432fb9702dcda6638bad758b5008c75851c3e907b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a significant number of external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://osakaav.com/userfiles/files/14414330395.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161586d6d7fa57---47831361944.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/25935308509.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/72314421237.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wasexazelikiwiba.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/12750312044.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dumadovo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/girutaxufifupixogidewax.pdfIn PDF document text
    • https://marosme.ro/hirek/file/ritevoruzoloj.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/8527006393.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/44428576919.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/lawumevopenujuzuxixara.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/nenibopotobolozo.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/kigelon.pdfIn PDF document text
    • https://lesura.net/userfiles/file/82127452841.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29427815547.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/laxusu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/kizelidavivelezorow.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/joxetodasoni.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/45579991495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=verriere+modulaire+velux+pdfPDF 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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 10528 bytes
SHA-256: 868b9cd6f40c52a62400a237cf13780770d8c3eb039251f1a5a053a5cd96068f
font_02_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 16084 bytes
SHA-256: 78de9091e5f3af70d2c9adc2345d5dc335196bf2877296c0f3d0211c97c60e4d

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