Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb2eda896477882…

MALICIOUS

PDF

88.8 KB Created: 2021-09-12 18:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b25d8f208ff44f9bf7d45e15d5a5c453 SHA-1: f34169ea8ec0f8d2b9b9233805e50aa2f676acc4 SHA-256: 7fb2eda8964778829cafefffb2c0184171623919d3119209317795aff9ee7889
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. Heuristics identify it as a link farm with numerous external URIs, many pointing to disposable hosting, and ClamAV flags it as a phishing trojan. The ML classifier also strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mobilenmr.com/files/files/58225531994.pdf In PDF document text
    • http://garage-ys.info/js/upload/files/puzofafulomajonatok.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120450274092.pdfIn PDF document text
    • https://zagi.hr/files/68498439023.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/39353366962.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/pezixe.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/nifemo.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109020537368202.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/46889011888.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132683e641f0---bixedidik.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/29169506338.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/39972846387.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/jukusagimofizofowalip.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/laregivibeviga.pdfIn PDF document text
    • http://fourfoods.com/images/files/52189758901.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/lusuwemofa.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120713246941.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/xujesilinofodul.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/34267081584.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/zojokuwurukapomefonuxuf.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/kegoriniji.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/35289257324.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/79730712905.pdfIn PDF document text
    • http://micruts.org/userfiles/file/39688849499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=3+uk+apnPDF 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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 9756 bytes
SHA-256: d6d1a56b622227333c0ea6e5c2abd0ba1eb3473e782d9d38d440f54bb463bd29
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 18376 bytes
SHA-256: 0b3efd85f179d94963e09780860973a7db40c8e2dd698c550e22c3c3a3f2f06b
font_02_sfnt_off00013dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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