Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2ebb0b3e4b9550…

MALICIOUS

PDF

67.5 KB Created: 2021-09-19 08:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8682d0d2da52a168268c764d91042ad3 SHA-1: c9157af7dff0017e40941477e86114c2c4d18c4a SHA-256: 0c2ebb0b3e4b9550208d1008b22514dd189fb97be47bc8cc771e57aeeb24e482
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and a small file size. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the distribution of further malware or phishing content via the embedded links.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://duef.ru/public/file/mupox.pdf In PDF document text
    • http://bona-agra.pl/Upload/file/60427572212.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/depojuvesilepawig.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/6088848544.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vopewivojobilig.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mirakojuxilinated.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/vuvufetujizoweju.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/16446911607.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/80249910101.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/vozarosozapivitojinirus.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/16568078510.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tejuta.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/tekuniwudel.pdfIn PDF document text
    • http://cabini.it/userfiles/files/57896049949.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/52195181597.pdfIn PDF document text
    • https://alkoplast.rs/files/20982957781.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8330b6d00ebfb5dfe1bc628bf987ad2f/3617784033.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/gafanixoxonigolorabofu.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/sudetutoretedegave.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/sifetamo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qg9a5lhnbvd474fa2t2a9m1b81/28500801357.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c89c63e48---tuxikaj.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ranimexolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ad%26d+books+pdfPDF 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_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 9192 bytes
SHA-256: cec472d94eb3fdb0df358ebc6477a54accfbb063ec4a1f62a798cb8c4131dde5
font_01_sfnt_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 14008 bytes
SHA-256: a6262ca99f7f76de1cc917e4c0a193fc2bb7b32df24f79107a0e3f2974df1252
font_02_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1