Malicious PDF — malware analysis report

Static analysis result for SHA-256 8914d888fb24b952…

MALICIOUS

PDF

90.8 KB Created: 2021-09-23 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af6b534d2638f401ff65418a20ba2d90 SHA-1: 82cfebd0cf7e99485e277b3fa3f65dec71c1df95 SHA-256: 8914d888fb24b952813804209f692df2e98ef8f5a538296dddcc1260d50329f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm structure with numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall picture of an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mimpishiosatu.com/contents/files/64279586189.pdf
    • http://dinobajka.pl/Upload/file/33508328638.pdf
    • http://racecross.com/upload/edito_fckeditor/file/56238551969.pdf
    • http://9262895.ru/ckfinder/userfiles/files/96743540364.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392930a4ad4---99974494153.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/niwonanenigiziwedo.pdf
    • http://dongtienlamnghiep.com/upload/file/27178569991.pdf
    • http://www.deco-interieure.com/userfiles/file/xamiterapuguz.pdf
    • https://businesslife.com/content/files/zujanagirujedox.pdf
    • http://hotechike.com/files/files/velevosapujume.pdf
    • http://costruzionibulagna.it/userfiles/files/nusalatagoduzosutonoge.pdf
    • http://veterina-naslunci.cz/userfiles/file/gaduwemobumubatodowa.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zalawo.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/40733165204.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081454abbc---71520263096.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/17922267891.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/nuramevarupezunogipev.pdf
    • http://studiodabo.eu/userfiles/files/42606665014.pdf
    • https://grandplaza.bg/uploads/assets/file/tepezubiduveri.pdf
    • http://greenhere.cn/upload/ckimg/files/202109131713237259.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/dibaxoliz.pdf
    • https://binhvi.com/upload/files/76240546462.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+gun+games+to+play+on+pc
    • 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_off0000f977.bin
94db974418654749594f2474bc395cc7a9760f14bd23c22f423008cf73a77736		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 10816 bytes
font_01_sfnt_off0001127b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 16792 bytes
font_02_sfnt_off00012a8d.bin
a209ddffbb3666565325a941769017b35ca08799e4f1e689c641f334c9c15e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 19428 bytes

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