Malicious PDF — malware analysis report

Static analysis result for SHA-256 8998fcc3c7f1cfd9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 09:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa0a984daefb73578b2fcb3147f88857 SHA-1: 00f4d7982079a9995699c40de2b5a88e27b05455 SHA-256: 8998fcc3c7f1cfd921c629be84a31594f96cf278f3615e6332c1e493f4b44cb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sirmamedia.com/ckfinder/userfiles/files/30335027905.pdf
    • http://coinproject.com/userfiles/image/file/89758948888.pdf
    • https://movingalpsfoundation.ch/userfiles/file/48243301030.pdf
    • http://fzcce.com/aimgs/uload/files/67325147633.pdf
    • http://munsusa.org/userfiles/file/20210914181352.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meburo.pdf
    • http://tc-antey.ru/uploads/files/45748494855.pdf
    • http://candientu24h.vn/webroot/img/files/ritabavegutajeletipil.pdf
    • https://underworldgear.com/upload/users/files/fotulabesitagujuponuxak.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/zobeji.pdf
    • http://netmutum.com/userfiles/file/7289470123.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/20727770887.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/gikeda.pdf
    • http://wienbildarchiv.com/upload_files/files/7553233477.pdf
    • https://pierrelemagicien.com/userfiles/file/90965651041.pdf
    • http://kadet-ck.cz/pic/file/77669626341.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147e3a28eeb2---vavimatabida.pdf
    • https://k31szmq42-nu28.com/contents/files/53738782656.pdf
    • https://npkfertilizerproduction.com/d/files/zexasudogewedaw.pdf
    • https://andana.us/files/files/sumejofavelozexukepot.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4a0521a14bbdefdf605fdff2a35f3d8b/48100552105.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+android+sms+backup
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/81175953585.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_off0000e029.bin
3135c3c6ed66e89c5affe988d7c824a2f1a5e75ad3509da075e3439b9ae7cd19
pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 17308 bytes
font_01_sfnt_off00010d20.bin
176b6bb14972bc597da6146a9e345ee21727a2d8aa4fc5f386bc99e2e54c3b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 11016 bytes
font_02_sfnt_off00012690.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes