Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbd4b71296e4225…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 08:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd77798d795b6d5d7bcfcc6bb664cb55 SHA-1: f8cbe6d2879eecd0e8a3b64eb9baed20276d65cf SHA-256: ecbd4b71296e422593ac8f67278513dfb15552ba138cbbc533dbc06c53018d2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=bully+games+free+download+for+android PDF link annotation
    • http://sor1310.com/userfiles/file/nifalepedamozifak.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/36827592516.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/xetalimodexuvo.pdfIn PDF document text
    • http://imbirimbir.ru/files/lomowados.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/32724615846.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/56846547354.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/25018222047.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/94015357654.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/bapijitipudepujup.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xiwukamadaneresenu.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/20171792940.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/zilapi.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/19504561539.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kuligaz.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508d79c60c5---xekiz.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-1/20210901213604541841.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/gimugurarapekexuda.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/34150638577.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219262030505466.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/balepemasilexeji.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gedonomasunowasibixenu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/33680499494.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210901102557.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_off0000aca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA9 10952 bytes
SHA-256: ca52cee717f3d2299e2fdc825445f270963233481d5792031e52296c123eacca
font_01_sfnt_off0000c5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 14948 bytes
SHA-256: 23ecb5971e8b59d5fc69e0ccfb3c600a56e7dec73b0188ceea173b9dcb29cf9d

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