Malicious PDF — malware analysis report

Static analysis result for SHA-256 616f718801a2b365…

MALICIOUS

PDF

66.8 KB Created: 2021-09-20 04:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b58e28e416a56722506cd3f826a7f8e3 SHA-1: a7b19d5dea90beb02c2dd509d8aca3570eb1eddb SHA-256: 616f718801a2b365ff410284b3028a9fe7353b356a483aa8a80815fc01c3dd73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to PDFs hosted on various domains, with one heuristic identifying a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nato-denkmal.de/uploads/file/nopisudadekaf.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/35560642966.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vusagimaveguxu.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/debifulok.pdf
    • https://k-newsletter.com/ckupload/files/jififubagosevogixamurenud.pdf
    • https://eccdc.org/application/webroot/userfiles/file/16242340405.pdf
    • http://risorsaterra.it/userfiles/files/34231832831.pdf
    • https://nergizleryapi.com/image/files/rejixirijovopinepudi.pdf
    • http://malabarisproducoes.com/arquivos/files/84044744561.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/7854546296.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/39413326.pdf
    • http://bellina.pl/userfiles/file/21255568413.pdf
    • http://373113.linker.tw/files/zipodibitabadirido.pdf
    • http://skulpt.in/admin/uploads/file/senevoleguji.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614305c921cbe---torifurarinanibamotevi.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/dejiposigom.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a5a6a7ab329465e139060544ac2471f1/46219505792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=unlimited+car+simulator
    • 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_off0000a9f2.bin
7812f313ace6d13192c4c1df683d7abf610dafdf8cdcbbbe6c2a9f0d820fad57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F2 10640 bytes
font_01_sfnt_off0000c23a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 16792 bytes
font_02_sfnt_off0000da4c.bin
d269fedc73690f67fb61daa75e8f37451617333c0ebae4541ca06c0ba24cdf2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 14588 bytes

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