Malicious PDF — malware analysis report

Static analysis result for SHA-256 614a91b4d542a43e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 12:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0fb3a086f5c3bfdde40995d376d39b9 SHA-1: 0a268adab6563f11c6a05ab3acb5a0f1dfe55ca6 SHA-256: 614a91b4d542a43effa09e085d3771605bfa6511300a623fd05d111853d22e33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://kxqcgs.com/filespath/files/20210910111040.pdf In PDF document text
    • https://fiscconsulting.com/userfiles/file/80213148795.pdfIn PDF document text
    • http://beiks.info/public/file/60525038315.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xazevedo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/24440518633.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/23621542155.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/dojegivupoguzefitirazew.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210904120146.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/zonezovuvuravonokub.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/84707375801.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/12944173472.pdfIn PDF document text
    • https://linardi.ru/files/file/24982052847.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/4434474256.pdfIn PDF document text
    • http://recviem.ru/img/upload/wobuxobofib.pdfIn PDF document text
    • https://o-dance.com/upload/files/rawujowowimatagis.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mitinemawej.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/72307062602.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/jawegonarasilufisabikevu.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/kafew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=only+fans+cracked+apkPDF 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_off0000ac10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC10 15556 bytes
SHA-256: d07e467aae9c42f398eb69c53caa5cb867263cea895656e5608898d29cd918b6
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10532 bytes
SHA-256: 82d2ac25fbfd4ff388f0996d94c770c2b838124ed3f8634dbdcb11e7bf288015

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