Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a368c4fd9d72a47…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 22:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07c67a679ededa4d430424de5bb8aaf1 SHA-1: 4d6cf51bcff3b9901459d523d6d8028feafffcd5 SHA-256: 3a368c4fd9d72a47ad6c3956a00e0563da55c0bf0f01a1ef796f1f6db8704b2c
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically noted as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=aplikasi+hack+android+game PDF link annotation
    • https://italvaping.com/file/99144392746.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2eb88a68---suxuzipifititefoduto.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/jezipikibozorusewobom.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109042032153773.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/tuginajope.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/33074296911.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/63040928314.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/18725250748.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/fonazek.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/23899402496.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/83720616857.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/tezupu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/tibimarejitigok.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/57858430502.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/15125215342.pdfIn PDF document text
    • https://songhongresort.com/img/files/5612846529.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/dijegaki.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43470901874.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/jawebupimutovunud.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/ziperuvatonu.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jafexinozoxutifariwanoziz.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/kijaxotejeretunezirosa.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/livabib.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/96573724821.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/gefusefis.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/bokaresig.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_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 10936 bytes
SHA-256: 8633577ce706babeb78100c0befc5a7df9cb446ab415427c4bb1ab8566eb08dc
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 16832 bytes
SHA-256: 6bb98ca0355bfca04ecd102fbbbf51f6e3f81460ee6aa562bad48ec6a3dba527
font_02_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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