Malicious PDF — malware analysis report

Static analysis result for SHA-256 090e7f4297f8f3e1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 11:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a80d8b328ac434ba5a6c3c5649790ff3 SHA-1: 58af8f534ea1170a11425e4f9d6e06a2145afbfe SHA-256: 090e7f4297f8f3e15e5836103286b23cf423d5930e4e80e0d76e651f2903e110
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many pointing to PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, consistent with phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ptk-tent.ru/userfiles/file/23973653722.pdf In PDF document text
    • http://candemdientu.com/Images_upload/files/6221277075.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/16371765292.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/26888783575.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/punedinivibidugezudagetot.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/wodifexuwaluride.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/zewiba.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/rebopepirevetikudiki.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/pisokowomawojexukisajasi.pdfIn PDF document text
    • http://alltechsro.cz/files/23506485080.pdfIn PDF document text
    • http://hueide.com/upload/files/jewavape.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/60363174527.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613891bfd1603---jitazakofagotapugabapusin.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161454924924b8---69752431728.pdfIn PDF document text
    • http://marymo.ru/uploads/files/92324348801.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/lopelogakoba.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/61534816270.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/10923301653.pdfIn PDF document text
    • http://dges.in/userfiles/file/10236324944.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/wiwubalojipa.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/morax.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/88921937299.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vipuluwotuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cara+membuat+shortcut+web+di+androidPDF 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_off0000c16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 15628 bytes
SHA-256: 1908e2012779d0080de51648901c53b5343f9eb3717c4a7813a855ab0b4733ef
font_02_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 10948 bytes
SHA-256: fc43e7782a10cd0c5b1d674c072ba066218c3a2e0d690c774440bbd42ea0a573

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