Malicious PDF — malware analysis report

Static analysis result for SHA-256 0deb0eea0d35e114…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 10:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b624f6967ab70ee69cae583604d31b02 SHA-1: 39a6e707e8d4ada306ecc3da41f6536249d812b9 SHA-256: 0deb0eea0d35e1149a8b079e999c8817b38333911da704eea3477b5b20171796
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=flying+car+transport+simulator+mod+apk
    • https://renault-service.com/userfiles/fumudiginugom.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c297e70e47---75572434927.pdf
    • http://isotech.si/uporabnik/file/ramukakej.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gixawexetewabevojiketomu.pdf
    • https://toscanafantastica.com/userfiles/file/74185971157.pdf
    • http://www.veslovani-vsb.cz/soubory/file/jumaxosafudafekatosomefe.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/dizajafojitaxakeli.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/zogegurof.pdf
    • https://luminex.pl/upload/file/retenowazorokotitu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/800b19a1243678cfd5e1358d116410c7/jufamemomakibaxexufib.pdf
    • http://garage-fuji.jp/js/upload/files/pubuzidevuda.pdf
    • http://rm-centr.ru/uploads/file/36120585186.pdf
    • http://spl-designs.com/ckfinder/userfiles/files/boxutopevuxuvoboderi.pdf
    • http://kapsalonindex.nl/images/uploads/4518007165.pdf
    • http://vervesimuhub.com/userfiles/file/zexejujeri.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/51215049311.pdf
    • http://biolabsrl.org/userfiles/files/zuwapetitudapa.pdf
    • http://khachsanmyngoc.com/upload/files/zogelawolikivim.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/61608863996.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/45196345250.pdf
    • http://darslaska.org/ckfinder/userfiles/files/gutonafelebibusisifeti.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_off0000f00f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
font_01_sfnt_off00010821.bin
a45af9a0161f9dfe189224734c244c9a5e16f717214f81ce8e435d4bcc124625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 16708 bytes
font_02_sfnt_off00013396.bin
06c709780656dc8afba6a19e9bf35760070ccae0b7bb76a6f30e0b88230bf25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 11008 bytes

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