Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92e43715d74365c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 08:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c19f8122059bbdf271be72a91ba4f671 SHA-1: 4a964f780363730b32f6b016e0b073bf7d779f3a SHA-256: a92e43715d74365c59403caa243a049a7f5cf86128224932efd718598ffbb8de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to a link farm suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thewesternmist.com/userfiles/file/76175379668.pdf In PDF document text
    • http://cbstav.cz/file/namasesatepenup.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jadaxogedazuga.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/9242709300.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/70339289880.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347db7ece19---suzurigozawo.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/likevuwewixu.pdfIn PDF document text
    • http://punaide.com/userfiles/files/kefisawuburubod.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/40753626012.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xifewafediju.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2e5d8e63---71682660882.pdfIn PDF document text
    • https://agermag.ro/mm/file/fogisuzu.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/44545940303.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/77772040827.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tapovebomevo.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobolenofovufiwomaj.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/68688547952.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/pulinalajer.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/33474400555.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/10523164815.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xewoxeguzonajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ps+3+emulator+apkPDF 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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 18196 bytes
SHA-256: 84057a754c4296e9ad2855f3e841b96e863688fcc0000fa74b03c07c2b737664
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10580 bytes
SHA-256: 0d0752fb12a0cb1de9f8c4d124099b9358ec5dcd64d8063951b9dd67e691ebac

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