Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f113a1b808b86ae…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 01:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8ccaf1ae9a345931abc1f4d9cc4e61d SHA-1: 865d75dbcb3baf78b0963cac76303edf8193874b SHA-256: 9f113a1b808b86aeedab942fff7fe14e18a2dcb6947d504d71d03a5d574ab248
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=talking+tom+game+apk
    • http://autoscuolemontagna.it/userfiles/files/rininevo.pdf
    • https://patc.fr/imagesfile/wibogunelegidowusologolix.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vazanopilekumowanipigi.pdf
    • https://charterboatdeliverance.com/uploads/files/3483368678.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/wedigoz.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/99813559770.pdf
    • https://primer-spb.ru/files/files/69543319033.pdf
    • http://www.vegagastro.pl/upload/file/21536430389.pdf
    • https://medbillings.us/lightspeedweb1/file/somuluzixatibow.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b148332fb---50479868829.pdf
    • http://sterenstein.ru/userfiles/file/katodamizimozid.pdf
    • http://benrassam.com/uploads/files/75907687223.pdf
    • http://didaconcept.com/admin/fckeditor/file/kezime.pdf
    • http://dallard.fr/ressource/site-image/files/40667970698.pdf
    • http://newkontakt.ru/userfiles/images/file/zegobasul.pdf
    • http://yurisolomko.com/userfiles/file/rawix.pdf
    • https://infrastone.com/userfiles/files/sarer.pdf
    • https://anthonygillant.com/userfiles/file/37747426804.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/kejugimupubumiw.pdf
    • http://fotostudiovaccari.it/userfiles/files/numosudugusajikuzolemi.pdf
    • https://balaji-technology.com/userfiles/file/8751418371.pdf
    • http://inciboya.com/resimler/site/files/63070663531.pdf
    • http://kramor.bg/userfiles/file/72607381817.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/26948387532.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_off0000dcef.bin
1b7753bf9ceeba94b6e0d040e6081b2ed70cdcbafa18d174739d3777334d490b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 18504 bytes
font_01_sfnt_off00010cee.bin
8a965e01c9774a4e054600ebda1a8eaaf3b90199437e48eec90e22f00eb3f1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10384 bytes
font_02_sfnt_off00012467.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes

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