Malicious PDF — malware analysis report

Static analysis result for SHA-256 285488c328b6ce95…

MALICIOUS

PDF

75.5 KB Created: 2021-10-01 12:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdb605bfd3df2a7869ef3b642e28f010 SHA-1: 87bf814a7c18b8970d710b8e84b76267651496ed SHA-256: 285488c328b6ce9542ba25b11221c58e10d7a8f3427871555e218326c2fa7870
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The PDF structure and embedded content suggest it's designed to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cs-web-design.de/ablage/userfiles/files/93221729361.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161509621b37cb---66943363822.pdf
    • https://samsunyapi.com/userfiles/files/faberatizukoratimite.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/jisolakofutinodaneri.pdf
    • http://alvit-bk.ru/userfiles/file/jasewigovefi.pdf
    • http://koutingchina.com/upload/files/30370933152.pdf
    • http://wernitznigg.at/files/jaselajebovuzifumoxanuve.pdf
    • https://sgicorp.com/userfiles/files/fabise.pdf
    • https://ahreco.com/uploads/news_file/gajafibarike.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/39853049516.pdf
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/dupinagazoz.pdf
    • https://aromamarketing.md/img/files/64853598507.pdf
    • https://sangolongphuong.vn/longphuong/news/files/jakonimopotekolow.pdf
    • https://xcheck.vn/uploads/userfiles/file/xinuvok.pdf
    • http://booklandbooks.com/userfiles/file/sufekila.pdf
    • http://galettedesrois.hu/userfiles/file/28147083744.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/xogeg.pdf
    • https://kaptenhoki.org/contents/files/mesabezaxovakurefawem.pdf
    • http://faradtvandor.hu/picture/userfiles/file/18090744710.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/47631400764.pdf
    • http://malabarisproducoes.com/arquivos/files/56691919682.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/zoxajazudovufowinusedavul.pdf
    • http://sz-nuoyi.com/Upload/file/2021100112060324828.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16152460e25fc5---zepemazobifiwo.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/63937084862.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+note+9+network+unlock+code
    • 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_off0000bdd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD5 16792 bytes
font_01_sfnt_off0000d5e7.bin
cf566aef58d3eaee41ff5f65495bfa7a0d1ca83b021492c40fb2126d156cafc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 18540 bytes
font_02_sfnt_off00010686.bin
82612564ce54cea9eb3f20fb932c49edc21e9fc2ecde1931d08be48b0d7fd39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 11140 bytes

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