Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b39a0962e27775e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-15 19:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69cbebe0bcae847653de58f00672f306 SHA-1: 8d32ff0dfbdf39c1dbd16ef75454d2e836886457 SHA-256: 8b39a0962e27775e50ee885b1ae01f14173ec54b3bb9e8e06134ea675857b8d9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste commands into a shell, a common tactic for executing downloaded payloads. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://zuche0551.com/upload/file/35605503416.pdf In PDF document text
    • http://quaint-house.com/images/blog/file/tanuv.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/rubin.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/49666525815.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/420b7b2622c970319a50ca0e957579be/45571635847.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zutej.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/bikukufalotaru.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/97997785352.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/bemuvigaloturuti.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/lukobasokotusatid.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/diladarudakon.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mazuxegefatejuvovarile.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/zofazavedojojuper.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/kijuzefenog.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/momezilobugute.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/49013508980.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/37238469378.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/73245892562.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef32a982b---bigiwofolosufidixaweluva.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/7270273008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+downgrade+android+appPDF 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_off0000b5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 10432 bytes
SHA-256: 21c229e3f6c1017313e7a935e5b31b32eae829669f677a99810fade511ca9a8a
font_02_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 16344 bytes
SHA-256: 0cbdcd4144d0a9a274bbab06bb230acbd3e313593af984530c374732dfa28a18

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