Malicious PDF — malware analysis report

Static analysis result for SHA-256 a408b31c790c0708…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 04:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0be056fb9f8778cc1a6e8a5f9c89802 SHA-1: 0bef9dbc790c8da85ac81d0a285ac2a3f0ea4754 SHA-256: a408b31c790c07087e43674b53597011be7ff3d098c700f1d3b664b2d2cfc27e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=poweramp+unlocker+mod PDF link annotation
    • http://szyuangang.com/UserFiles/file///33643524817.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/62992506771.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/pafomeragagizu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hv99f4hcf2e4ld3d8fggeng0n6/66327930671.pdfIn PDF document text
    • http://xenangheli.vn/public/files/lemeruligizuganaged.pdfIn PDF document text
    • http://lovesenergy.nl/file/45269016378.pdfIn PDF document text
    • https://rajakedua.com/contents/files/niwifipumisapuguralaxikaj.pdfIn PDF document text
    • http://torgoborud.org/images/file/kagidinojuvuweriluburo.pdfIn PDF document text
    • https://spacio.hk/attachment/file/rutixusozufi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pikigubuwexatufinizula.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/ditonapekiwiselenonibalon.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/gupuxu.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/gexiper.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/xafaseterazawoluxu.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/walususerijuxobipowil.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/91481345223.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/66075550386.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/2928307773.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/garikimekudizapexoli.pdfIn PDF document text
    • https://auto826.com/uploads/files/54984224522.pdfIn PDF document text
    • http://asqcert.net/files/files/83300098156.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/77297455081.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/39204212125.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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 15436 bytes
SHA-256: ff42c535cdbb9c1009b0af0a216e0e49980936cb62450168ed875ba121cdb1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10596 bytes
SHA-256: 83dbf8d25a492bce9b25bc2354fb008b610491298c0f0c59f77f711f184f8ee4

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