Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ef9a01139f002f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 21:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca751a90548e5bc87e039677c8dd0484 SHA-1: 156e1f01ed00c5d1fa0e7c909026eb5a5d69e80c SHA-256: b6ef9a01139f002f4053aa5b367429563bfc0614071e614aa68947e7316ec231
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=free+prototyping+tools+for+android PDF link annotation
    • http://astorandblack.net/emailer/userfiles/file/70497974995.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/25233620686.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/82695098958.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xusiretosanomepobapi.pdfIn PDF document text
    • http://tochuchoinghi.org/files/35179274763.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wusenomovaz.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fegomume.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906145456.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vowipamixuzakagipedafipi.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/vorufupu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/powemiwozikifurer.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/82728514110.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/sajonuzegobamopagukamav.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/lubipajute.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/niguruxi.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/besipifamalumez.pdfIn PDF document text
    • http://videlec.be/ressource/file/gutijonofomitipukobiduw.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/tagimiwal.pdfIn PDF document text
    • http://delve-cr.com/uploads/jajupasugexapafinijatasob.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/dumelejorideni.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/gugafofuj.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kabibodugonejubemi.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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 10764 bytes
SHA-256: 864363dce5c3915bf2bbb290672df3648eca919d007319e391a7c0e357c879ae
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 17176 bytes
SHA-256: 7f333e49918ec98c7f6b96353d75534a07e93077cacdb91d33258a752e3abd16
font_02_sfnt_off00011726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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