Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfab4cf65b11904…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 16:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a75c25f8a400d4d2a21434bfe7090848 SHA-1: 72567d3fcf98e434b40d58e8aba8f94e7f6f04be SHA-256: bdfab4cf65b119045be93239f95ba2bd5183162bc98e23ae8bf8bc77802da263
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are part of link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=apk+truck+app PDF link annotation
    • http://mesterteto.hu/userfiles/file/jevukabijuxuv.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/86430469858.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bbfe6e3c---22456994143.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/34615045858.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/vorijetemosifadesoded.pdfIn PDF document text
    • http://domosplast.hu/files/file/18338693205.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/1338882604.pdfIn PDF document text
    • https://expomediainc.com/upload/file/59348290052.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/bimerux.pdfIn PDF document text
    • http://rc-modeller.se/images/file///nokotajixa.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/napefikinan.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/87479839544.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/42831232683.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/99637081702.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631036014.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77869415253.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/52299751822.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/fituzimu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/38503697439.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/74345774402.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0c9b6ce0---18024956002.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_off0000b573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 9880 bytes
SHA-256: 7c3ef6f97e3bb50f5c3b426c2a61d4bdf09188c9da12d3870ad7a0882c122a9c
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16460 bytes
SHA-256: b0fa4a729bf26e6d6bf347a995e8a333dd272028557c53693e98eca8c6b8f533

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