Malicious PDF — malware analysis report

Static analysis result for SHA-256 6656ea6fca5d4882…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecff80be6a2a145dfd2a527873087698 SHA-1: 011fcf32d6c57c43a6547a5e5d60bb7ca34f706c SHA-256: 6656ea6fca5d4882fee987dbcb0eb1d351e028a9d28c4df6e5c1d784649fd20e
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a single text block and containing an action trigger. Heuristics indicate it's a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://aordonez.com/images/contenidos/files/dosejokugonelepazeg.pdf
    • http://rgn2u.com/userfiles/files/26282431460.pdf
    • http://jn-zhsc.com/upload/77288808646.pdf
    • https://nguyenthelong.net/userfiles/files/jipige.pdf
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/virumujuzinakim.pdf
    • http://gibisch.org/files/files/dosiluruxuwubuwogofisuto.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/befemuviguter.pdf
    • http://www.leasebridge.com/CKUPimg/files/44513440044.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee1987450---mozivusakelelunegodub.pdf
    • http://giasudaihocsupham.com/Images_upload/files/nuwerijoselozir.pdf
    • https://sbsoftware.ro/admin/userfiles/file/90927856703.pdf
    • http://onlytech-tunisie.com/userfiles/file/86014938234.pdf
    • https://at1apigroup3.com/contents/files/61200890092.pdf
    • http://ufnk.fr/app/webroot/files/file/dojumufugenete.pdf
    • https://safetypadlocks.eu/eurostyl/photos/file/68977795676.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/wutogewam.pdf
    • http://studiolegaletrotta.eu/userfiles/files/80820758651.pdf
    • http://idcla.net/upload/files/fujesedesutunon.pdf
    • https://abouelhoulgroup.com/userfiles/files/verukomutigikef.pdf
    • https://tl-systems.hu/files/files/liwuveb.pdf
    • http://j-club.eu/userfiles/file/40544196166.pdf
    • http://maksimetall.ru/files/rujomamigemu.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/pexijakagowulititiloxe.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148769ad3176---23612281334.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=como+formatar+tablet+samsung+ce0168
    • 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_off0000b095.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 16792 bytes
font_01_sfnt_off0000c8ac.bin
4820e650f9f561da35862b3e9ee572b6a756c2a9abd567ee52b20230d10247b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 11408 bytes
font_02_sfnt_off0000e3b0.bin
3dbe8730472867d2b99c892dedd477406652ac9695e9c43f3439e67d3f480624		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 13924 bytes

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