Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e26bcd2a4a98c5…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 07:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 020caad3ad58936e4332e1a12d785e9b SHA-1: 5a0b02e842bf295a90225e927751c55516c9c6c3 SHA-256: 88e26bcd2a4a98c5749f812176bdb782d95abf80640502f506def9051d39a7fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is part of a link farm hosted on disposable infrastructure, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=best+addictive+android+games
    • http://quimis.net/js/ckfinder/userfiles/files/68768896123.pdf
    • https://happyfun.tw/uploads/files/202109070214243476.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/pusibokunedoxexodonu.pdf
    • http://ichieh.tw/uploads/files/202109041421533044.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/pufiradewuze.pdf
    • http://vipforiraq.com/userfiles/files/kizapevi.pdf
    • http://simkoongschool.com/uploads/editer/files/75516148225.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc259ef7e---xisezugisodunu.pdf
    • http://edv-denk.com/userfiles/file/73816255665.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54459303006.pdf
    • http://vindindex.nl/images/uploads/tijewedowoputexokuga.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b455b27d6dace578219bd4884b1c7cde/denojozu.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/39508738443.pdf
    • http://kaymccarthy.com/immagini/file/75887208761.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109070912481502.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/19923862602.pdf
    • http://alrabbancapital.com/file/files/latojinumemasarotidabaju.pdf
    • https://suacuasathcm.com/uploads/files/mutizazeguzaxasavuk.pdf
    • http://pensionpoint.cz/userfiles/files/vunerejewefoketujuli.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/tumijotepabozaruzolarum.pdf
    • http://thegioixedap.net/upload/files/towolexirutadap.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd12034ee---rabopaluranukogitopagafa.pdf
    • http://tipsclubcr.com/campannas/file/pajoxipofuxemader.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377832c8145---rubevalovotawililopix.pdf
    • http://larben.cz/media/images/upload/file/falare.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_off0000eba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 16792 bytes
font_01_sfnt_off000103b7.bin
14976a7992f6fcdc0b404c9f0364cb074a806f6c33e6b82b6c99dee14196aba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 17560 bytes
font_02_sfnt_off00013117.bin
822644d975f0a9dfcb17a85a922b519e0a533c707eb34f6a109ce6e04b97294f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 10788 bytes

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