Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fcf84acfb793fe…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 15:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fa4a2c7198dd39ef2b91f6c74cd3b12 SHA-1: f6bd3556fa6c233e347a468834b6c014190414a8 SHA-256: 05fcf84acfb793fed542a63b5cf645fb7be66381f23326e6df22d9c9c5335f7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The primary URL, 'https://irlanc.ru/uplcv?utm_term=t+mobile+apk+download', suggests a lure related to mobile applications, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=t+mobile+apk+download PDF link annotation
    • https://yaofangpeixun.com/upload/files/23209587348.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/98c92d1c042a5adc3030b678ebd13074/33533125961.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/zobigetitoxonogaforovivab.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/15449773430.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/lodaxozebawefikanek.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///85286059727.pdfIn PDF document text
    • http://tiquital.com/documentos/file/mowutamoju.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/98510561364.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/wakozumunujomadetowaxazu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/48025369726.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/gerebagerirefegav.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/85507273103.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bde9e9332fddc95315161d93ead371cd/76104052669.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/dilida.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/wunomobo.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/35395831349.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/48679940588.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/17628668116.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/melure.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dewipurutepam.pdfIn PDF document text
    • https://istanajp2.com/contents/files/dizadazasujikag.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/fososajenewikenipa.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_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 18072 bytes
SHA-256: e9cfe095ba097ee5749b3432531836f62fea0f158658c85f8730198184ecaec9
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10468 bytes
SHA-256: 01cc2d0eefe66746dd1e08088b222eb4c932e061e0423663eaac76b8d66afe93

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