Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3419840470dc32a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 11:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 414eb82cef0f8228e696fb42340f4fa3 SHA-1: ce048c4bfc5eda41bcf0e47a0a109438f622de47 SHA-256: f3419840470dc32a3212e4e1ae893e2fd8ffbdf9ad8d3daa1ac19341b785c470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicates this malicious intent. ClamAV detection and ML classification further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=game+virtual+pet PDF link annotation
    • https://cualuoihoanmy.com/uploads/userfiles/file/49557540134.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/39057542035.pdfIn PDF document text
    • https://proxus.nl/file/84836496076.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19748436502.pdfIn PDF document text
    • https://tmtteks.com/files/gekafedawasadosinibunaka.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/sivotanaruxenipudovozun.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/96083845121.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/lavonaponumowetobow.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/45550750751.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/sosefewalizuzopasuruzumu.pdfIn PDF document text
    • http://vejwun.cz/images/7791744670.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/55466007791.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/14250595253.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/79066424977.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109240505195263.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210904_AC1674F2DB01700B.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zolepubowobekivabegujutem.pdfIn PDF document text
    • https://kapefashion.com/files/files/40440736948.pdfIn PDF document text
    • http://superazs.ru/images/news/file/bosijadipologilezusujapag.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/35877714006.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3da36bff---nakudanefejusuleki.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/11871390216144c8aa1fbfc.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/14928514959.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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16364 bytes
SHA-256: c3ed1340027bbe4d2f2c765001306d9618620a6d55dfa92ef191f7fba5c65fd8
font_01_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10224 bytes
SHA-256: a383aecc532aa581c809492058bec4c3bfde84e67388907bbbc9d969a224bef8