Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d870c3944dbc1d0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 14:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 622e4ef2fceb6deee8f4a431d7c4db68 SHA-1: 1723b8ff218aed5ca373849aae5b25558a4444ba SHA-256: 3d870c3944dbc1d07f72571e6e4497bee94451e1827186745f4c0aa3a8b6c9af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm or a distribution point for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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://drafthe.ru/uplcv?utm_term=tube+play+music+downloader PDF link annotation
    • https://iuoshili.com/upload/users/files/gazev.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rudafifubojamumunogaz.pdfIn PDF document text
    • http://househouse.it/userfiles/files/jiketap.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/44155676362.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wesebizaluv.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/xolidefejowibaresurebep.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/sumajoxuvaxebibokugime.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nimepen.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiroruwofofexodul.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/lawesakinis.pdfIn PDF document text
    • https://frisch.ro/files/file/57425718850.pdfIn PDF document text
    • http://a899.net/userfiles/file/88045264953.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/64034541262.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/giremexogujo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/27397048634.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136656ca5c73---xiwavevujoveluzilesiwura.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/janafeluvejeku.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/82372934597.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/zolosupepepo.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/89864496625.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/defesofa.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/nufodiben.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/badomibetisosapuz.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/dokinetoxa.pdfIn PDF document text
    • 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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 17140 bytes
SHA-256: 524468c1c2513d0f4dfe9ea15c12c762f4584804d2e2e901ed4017fc62fb2516
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10980 bytes
SHA-256: 3a161332b83e39380f11e198af08522079a02c079f074a6015bd465eab4f0825
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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