Malicious PDF — malware analysis report

Static analysis result for SHA-256 8336b6c1ac0edf50…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 16:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b1cc9747fdc0bf5416d1bb4ce6924f3 SHA-1: c4a6b4f8412be7015c272e4b1f7a20818dcc6726 SHA-256: 8336b6c1ac0edf50cfdf21a485b0488934b3eff774748ffcc6b62d8c427545e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The primary attack pattern involves luring users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://clubon.top/uploads/files/10525720431.pdf In PDF document text
    • http://wirtrauenuns.ch/images/file/48093828232.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/79200656815.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/54508979585.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/15982687858.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/57032360984.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/73654105575.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7svfg1dluevl9b9p9utt35tt51/segewavedexodox.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/milesarimarigokixafeb.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ab5507d3---fozekifabesutekogibo.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kamevuderowinatevisuwup.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakidodojoxebideb.pdfIn PDF document text
    • http://jadeite.ru/images/file/rukegajaguvetedagutowi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///33582287112.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/jiratipagoxodevuvomep.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/50915931591.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/kanalabiviluterikiradol.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mivijojuxebimoxusuren.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/49028806622.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/42737899014.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/46275705238.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/52875893897.pdfIn PDF document text
    • http://npas.ru/pic/file/papogof.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/wiredonuwas.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/57702629601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cool+math+games+cheeseriaPDF 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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 10604 bytes
SHA-256: 58cf88f198c1eef6116c4f984cd26e572c393dedf5607733ac0921fad28d4186
font_02_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 16572 bytes
SHA-256: 8c566a3d86c81fa1bb0a79316820793c2776710e18c0b154cba8f7c3d72897fc

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