Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b430fc741cb981…

MALICIOUS

PDF

67.0 KB Created: 2021-09-28 00:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc5b954250d1206e01cad0048b947e0e SHA-1: debd773349468f67ca2f4f9e5433acdd1b212b10 SHA-256: a4b430fc741cb981b8f6abbc1e3742a62ad39db95ea02ba4588da7dd5a49ccfc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution. It contains numerous links to potentially malicious PDF files hosted on various domains, suggesting a link farm used to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 66 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 http://rootbeadmill.com/upload_fck/file/2021-9-25/20210925083647332819.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9b8231a2---fulenasakerimufikadiwute.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/3644305543.pdf
    • http://ip-malkov.ru/uploads/files/wokib.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/risozog.pdf
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/70901303848.pdf
    • http://smartvoicecom.com/userfiles/86839432727.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/vujegu.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/15124161166.pdf
    • https://chaletsuenodesol.de/files/31097642032.pdf
    • http://studioassociatoemc.com/userfiles/files/zigirovur.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/77387886720.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/51606944649.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/fefipotedezum.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/vemexusomevaxupogana.pdf
    • http://thebrownbag.vn/upload/files/63588048279.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614639347c7e8---kidopazexetebudogok.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/difikutuzupijezap.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210903_6BE90620AC72F7DE.pdf
    • http://thessalonikiflights.com/files/files/poduvemuronofefugi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+dns+for+mobile+data
    • 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_off0000ab19.bin
0ac0c63bc9fd9e386ff84073d6529f67fcab8ac8c61c8754a4fc0c0adde4897c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB19 14032 bytes
font_01_sfnt_off0000ce0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 16792 bytes
font_02_sfnt_off0000e626.bin
679d52a0d03cfd01fcdd03a14aaf6ee8863c3218653887fc7cc0683b629dfafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 10732 bytes

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