Malicious PDF — malware analysis report

Static analysis result for SHA-256 f734b2825d6b5ed4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-22 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 336df5217a3edf986f65456b82613f50 SHA-1: d1765b4b21665869af7fa1b6f879666aa359bcdc SHA-256: f734b2825d6b5ed40619e1a37f864f59017ece7a575fd879871136feee237398
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs and a heuristic firing indicates it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of further malicious code or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=zombie+roadkill+game+for+pc PDF link annotation
    • http://gdfsztal.com/uploadfile/files/25116989287.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sojin.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/lotelinusogiba.pdfIn PDF document text
    • http://sptcrane.cn/d/files/zipepafetiwa.pdfIn PDF document text
    • http://lex.tj/img/file/93553289119.pdfIn PDF document text
    • https://schmitz.cz/res/file/vedar.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/8215682219.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nevizegabegazudefag.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/32256436032.pdfIn PDF document text
    • https://goodline.by/userfiles/file/dofabajigiluzudiv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3f57960dae633557518bf4c64edddf50/votelujewezanejar.pdfIn PDF document text
    • https://davaocarrental.com/images/file/vofiworagibanomidor.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/kixonipugezoveni.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/37564013711.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/94892212368.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/4240030003.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///25297955909.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/16976176261.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/jefixojujaxudegor.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/87199599302.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gggb5g4a48qprqu6hksqeif33t/91488739298.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/50169272257.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_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 10788 bytes
SHA-256: a3850c38e12bdaea72cd95fe3543df733d7ac6438c1639e15d8eb8af7c6fac5d
font_01_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16304 bytes
SHA-256: 21b65927007aa3e23b1e4f4716a87642e11787299330ef62326bd342a76af146
font_02_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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