Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff29fc29250433a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 08:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ddf0a26aa0e9e02d2c4c7c5888eaaa2 SHA-1: 9aef4832024a054b3232aa45745a1b6dce0520d3 SHA-256: cff29fc29250433a5dc18ac3c674d29f53b84abc29b0db9849787c6abd7093fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF is part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://woodwork.pl/ubezpiecz/obrazy/file/53383563280.pdf In PDF document text
    • http://ibconsulting.it/userfiles/files/87534379919.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/85800707839.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/wosobodebiforatowadumeva.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/besajudasumonef.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/rudajikikasigetususim.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/wuretifaxutotojajudos.pdfIn PDF document text
    • http://showdoimovel.com/files/files/gafokabubab.pdfIn PDF document text
    • http://wwsm-us.com/files/file/79959203732.pdfIn PDF document text
    • https://il-gusto.com/images/file/25736158237.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/tojidapizemisukimu.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/xuzifezisefosokepozamav.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36525264159.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210924070004.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/33671232481.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3867b389f1d9c9660bd1ac4707cea2d2/vumusunevaw.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/56517402243.pdfIn PDF document text
    • http://potlista.com/file/files/pokevepupijokixudekowim.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/51868426326.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/29255474497.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/riwoxagisujanol.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/50595725881.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/18648655889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=online+conjuring+3PDF 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_off0000b291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 20016 bytes
SHA-256: cf3e5cfd8222abee1dab34543e65d87065eb12de058e5dcfd2c2825d0019e5dd
font_02_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10404 bytes
SHA-256: 3a56e5366124298606a6262d9488ad43f0c92e14724bba8c7a0d5bbc33f48674

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