Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d859897215909ab…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 18:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5184aff3472f58e6c84e7952ab84741 SHA-1: 82a90a01d397b9740832e82b7d59e5ec45e16983 SHA-256: 1d859897215909ab4e95197ce3a29f666d3fa56db08f7daa99363b17f520dc45
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. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://iccarrentals.com/files/file/9356782353.pdf In PDF document text
    • https://rajaketiga.com/contents/files/julaxe.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/berepemubikelazepikivova.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vokijupasopejude.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/morazazeduselu.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/jakivupixufolajoboxolamu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/rerefegoz.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/tenevifutokikibevopemixo.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/6950476753.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/67745517162.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vewebenodus.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/17173544966.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/ruferidalurimajuxi.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6139e6a7b5f19.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/51449456748.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/14731830865.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/walonameke.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/92507883019.pdfIn PDF document text
    • https://tadimtursu.com/image/files/levijafenitufanev.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • https://primer-spb.ru/files/files/49628304094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=communication+not+permitted+by+network+security+policyPDF 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_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 11236 bytes
SHA-256: dc999beff6b385b0a2887e2429763e19236dd69450632765b94fc693a4840f83
font_01_sfnt_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 17948 bytes
SHA-256: e69a9e6e859ceb2dfea3fc7afcae7c725103f0e0050669ff4f2679e2e143cc99
font_02_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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