Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8436524c2df1f6e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 15:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 233b35b94d6b8b8914922bd044f2d914 SHA-1: 8bc9f2858824e7412dc6a87540b92134bf95502d SHA-256: f8436524c2df1f6e8f2878ad1ee9d0f696216916960c4fecc81f751dcccf734e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URIs indicate a likely spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=free+editing+program+pc
    • http://baloneacessorios.com/_upload/file///dovasawaf.pdf
    • https://cargotavio.ru/files/file/nogovamijivibadofu.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/59174853114.pdf
    • http://myhomeinparis.com/userfiles/files/93585072320.pdf
    • http://cuatro-pr.org/sites/default/files/file/fazufixujilodojexilu.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/gabaruzenusoxo.pdf
    • https://sanipacific.com/attachment/file/85296889488.pdf
    • https://reklama71.ru/upload_picture/vuzededewumari.pdf
    • http://w-mill.jp/images/file/pikamir.pdf
    • https://pvcmikser.com/upload/files/notiz.pdf
    • https://nhahangthanghuong.com/uploads/files/61821442676.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/39978466558.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210918025554.pdf
    • https://speculatio.in/userfiles/file/30175700020.pdf
    • http://pnmanagementsolutions.in/uploads/geduxujaxofujewa.pdf
    • https://transmar.biz/ckfinder/userfiles/files/27699743079.pdf
    • http://ariogalospspc.lt/userfiles/file/tarez.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/426019ac76575cf511ea564226657c17/40134994859.pdf
    • https://larrialdiak.es/files/galeria/files/fosimovidegulisavagade.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa3553829---68750383538.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/nagotofatesil.pdf
    • https://ksi-system.pl/editorfiles/file/bakutetepow.pdf
    • http://mikllc.mn/uploads/files/39233969063.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/19385786568.pdf
    • http://hyundaihungthinh.com/uploads/images/files/15504207296.pdf
    • http://kbchina.de/upload/tofujidojujes.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/pigilebavilawobosojerelow.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_off0000b69a.bin
dba49f28b9f58bbf808bb96d1ec97e6d330a98f11af4ad60843467e52bf78a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16356 bytes
font_01_sfnt_off0000e0b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 16792 bytes
font_02_sfnt_off0000f8cd.bin
5acfc4168e48e4933503f77cfe098371e03fcae6eaeb30aeb295aa89ae0ca123		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10620 bytes

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