Malicious PDF — malware analysis report

Static analysis result for SHA-256 4218d9d44e4a7d49…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 16:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e97fd8017bca2948b5d64711a284541 SHA-1: 13f0b7468db4a6ade492a5b69f3b60338dd0624b SHA-256: 4218d9d44e4a7d49fcb6ed85d0075b4a843f26d5dbea210d835b24dc3639a5c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or unknown domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/65613580733.pdf
    • http://spellenindex.nl/images/uploads/jifinufoforumewewo.pdf
    • http://www.nachtruhe.info/up/files/figefudazotepowesoram.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614122b515a8f---22368894546.pdf
    • http://phuvuongcorp.com/luutru/files/pomozuxef.pdf
    • https://k31szmq42-nu28.com/contents/files/41610678952.pdf
    • https://egyptsuntours.com/userfiles/files/63310702324.pdf
    • https://myparrotfood.com/user_files/files/65696787699.pdf
    • http://archinfo.ru/uploads/file/68849822315.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/10330122191.pdf
    • https://cortemadera.com/wysiwygfiles/file/30484555295.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429c850fe07---41591537321.pdf
    • http://hotel-ambassador-nice.com/upload/files/67591739942.pdf
    • http://groupkaishan.com/d/files/lelatujevozepijujukapape.pdf
    • http://fotografieindex.nl/images/uploads/16410221119.pdf
    • https://doan295doson.vn/namthuan/images/news/files/96879304057.pdf
    • https://aspaeng.com/files/image/files/dogudeduleluropusowuro.pdf
    • http://officinedesign.it/userfiles/files/62995749172.pdf
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109011700168507.pdf
    • https://motiwalainstitutes.org/userfiles/file/pifukabinofevozeju.pdf
    • https://cgeminfos.ma/upload/file/94105408355.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89790160632.pdf
    • http://teranor.com/ckfinder/userfiles/files/86774848381.pdf
    • https://joinvita.com/neu/userfiles/file/88098832786.pdf
    • http://mudrberanova.cz/userfiles/file/wojizemivazazakis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fully+kiosk+apk
    • 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_off0000e774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16792 bytes
font_01_sfnt_off0000ff86.bin
8832e2db1857287fabe69ab53b92bd1df60fe0e5aee89114e533cdd63869d696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 18332 bytes
font_02_sfnt_off00012fe1.bin
5f8e7c64efe0c3d7346b1df697f059737754826c96261b3d44538714fbbf262a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 10096 bytes

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