Malicious PDF — malware analysis report

Static analysis result for SHA-256 21385f37f291032f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 17:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6ed16721b42721efc45da3f2797ef954 SHA-1: dd3e3c7f3c67e67d2b2712a3da27a93036cbf894 SHA-256: 21385f37f291032f6c8e92cfa54d73da6dc789221aab6aae5984ce750d3ccb7f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates the document is image-based with a click-outward action, designed to trick users into interacting with embedded links. Numerous unknown reputation URLs were extracted, suggesting a link farm used for redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://lecormier-menuiserie.com/www/upload/files/26964792929.pdf In PDF document text
    • http://www.chubsorn.com/file/files/87447090724.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/lipanoteginumepasalitor.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/23173984988.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/44882380083.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/pekomijep.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/mixezisixuziledewasumir.pdfIn PDF document text
    • http://jonellchem.com/upload/files/29145307509.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/takudolegadawilevul.pdfIn PDF document text
    • https://dcimx.com/files/7995924735.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/42526963239.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/fuputigaku.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210905_37B6C2A09F48DEA2.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/5257707907.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/21554599071.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/52938561684.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/74f499cea155320647ede4d887cd23c2/83748316731.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/refuluzalutinezozujolovom.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/watewowowurilodem.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/68723729893.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/puvadi.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/94448765075.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/lotarosobulidukumulu.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/27538631712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+check+for+updates+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32E 13952 bytes
SHA-256: 8a1c2fe7042de93f6a921102173b1dad263e659d15ae6e5531807c964ec4d78b
font_01_sfnt_off0000d57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 10940 bytes
SHA-256: 679231aa54ab4804a0d5314af9b99c0d6f8297302b3bc10eb5b0eb7f880da6cc