Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0de413de7ecd46a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 10:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 065e698ca8bcff6da5070ccab9af12a9 SHA-1: a9887c4f8574cd8d973050144fc5f320dc696860 SHA-256: f0de413de7ecd46ac2bf3b6a5f59a7dcb2b79abf24aa2ff6cc10f655658c42bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/267504aeac26b63f5057445833e884e1/xekofofirowiviviguk.pdf
    • http://warmistore.com/userfiles/file/97043530739.pdf
    • http://swhos.com/upload/files/81927385667.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9c570935---judipozifiwupujepigipurop.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/75398769698.pdf
    • http://nfc.soo.jp/file/tiwobuxurufarugurixalowim.pdf
    • https://tepatsasaran.com/contents/files/22306063789.pdf
    • http://zulassungsservice4you.de/bilder/file/33652858889.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/73566325408.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/karodiv.pdf
    • http://abpjse.news-read.com/upload/files/misonodijutofutisolejov.pdf
    • http://dtyxbpzx.com/filespath/files/20210919114730.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/duxagobar.pdf
    • http://nanouklid.cz/upload/file/58617836778.pdf
    • http://immobilier-valence-agen.com/userfiles/file/zitukubobanenogilisej.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/bunuwibejolaxexavisada.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/divowebakas.pdf
    • http://kientam.info/uploads/userfiles/file/39554084489.pdf
    • https://ka-base.no/images_content/file/peluzikodav.pdf
    • https://ruta.hu/ckfinder/userfiles/files/8641573535.pdf
    • http://hyundaidongdo3s.com/images/files/zexirimegoregiwutidifepiv.pdf
    • https://aspirans.com/files/file/zidajaripidu.pdf
    • https://alnahamgroup.com/userfiles/file/68150570964.pdf
    • http://matstravel.ru/userfiles/file/kipitajelogilaxajer.pdf
    • https:///images.google.co.ls/url?q=https:///
    • https:///images.google.com.vn/url?q=https://
    • https:///images.google.it/url?q=
    • https:///images.google.ht/url?q=
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=skin+generator+fortnite+ps4
    • 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_off0000c3c7.bin
af3d8cfbbd4b6f9483ca9b0cc3871549eeb89074db40017768519bc60cf9debc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 10732 bytes
font_01_sfnt_off0000dca4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 16792 bytes
font_02_sfnt_off0000f4b6.bin
84c9ea140a58891844353e08a88153e8edd2accd7c9dfc1a4633dd6e5a9dfa97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 16544 bytes

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