Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7f11a0e8ebe60b…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 06:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c3f3a0789fc8e702df5df17ab87514e SHA-1: 9f20c2c7e70ed1dcb3ed52c9aa3109fd490322a8 SHA-256: 9c7f11a0e8ebe60b162f1a1a284069908ed35b5e1232839605a40b02aaf44bc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://crewmak.ru/uplcv?utm_term=ideal+pulse+rate
    • https://7mark3t2-7aya.com/contents/files/muxexu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1eac59d9---dexememupokokumiwewikulis.pdf
    • http://chiangmai-esc.net/user_img/files/36842057032.pdf
    • http://stensoproject.com/userfiles/files/zevadujofonitusebezasiwe.pdf
    • http://qhchemicalsfeed.com/upload/files/27279144397.pdf
    • https://sausalito.com/wysiwygfiles/file/51238640271.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614658a94917a---14301140336.pdf
    • http://naturallabs.fr/userfiles/file/92980483327.pdf
    • https://smobiil.eu/userfiles/files/munoserifurunapurenez.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210909_1279A9F81DA282DE.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/28387030388.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/13492650731.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/40933731388.pdf
    • https://hophamthaibinh.com/upload/files/fivididuxiwonunezapan.pdf
    • http://jingyilin.org/uploads/file/29080508830.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/44007376494.pdf
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/serekafaw.pdf
    • http://holzweiss.at/nevizejawuligolofawap.pdf
    • http://life-homeshop.com/asset/uploads/files/68237301433.pdf
    • https://olamare.com/img/uploaded/file/fikexuxilagukoxilow.pdf
    • http://massageindex.nl/images/uploads/dedotivuxafuxo.pdf
    • https://resonanceacteurs.nl/userfiles/file/71497931351.pdf
    • http://castel.lu/userfiles/files/pixom.pdf
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/85280378414.pdf
    • http://gocep.org/data/userfiles/files/zafirefudusamod.pdf
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/mimega.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/wedelinexawidekoloj.pdf
    • 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_off0000dc72.bin
96ea9684a3b5daa469f982e9e1c0a965e9483c35fb2f778a5bcfa72d1b5517a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 18736 bytes
font_01_sfnt_off00010d7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
font_02_sfnt_off00012595.bin
3e65e09f2961836834c0568ef30d3baa17a7431a4ad20fcf9c80ce5eb3988ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 10120 bytes

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