Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe3f8e7a6aed3e2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 13:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f35a9038f77ae5bf17fb000cb33847e8 SHA-1: a621357b6309f612a5d7c72dcfe2227b4e5b9d56 SHA-256: dbe3f8e7a6aed3e2bf973a56b51caa956cfd7c2f2010691f836d955b07b70c92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=bluetooth+force+pair+apk PDF link annotation
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/97679958266.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/34709536730.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/10025217140.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/tizuletowugudatu.pdfIn PDF document text
    • http://cobmedia.hu/include/46721401246.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/6795883438.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021916317352432.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/85119063755.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/78967611098.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dltd6qhksp7ahsg6o487p9fil2/80560360557.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/rarebutegenodiloz.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rezamuwateforumesewowo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd731719b---70117737825.pdfIn PDF document text
    • http://greenglobepms.com/uploads/18258150314.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/91869660417.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/mowoji.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/95172315643.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/52648885276.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/60138117021.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rulodudubaxutax.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/65169763436.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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 10552 bytes
SHA-256: a47a4225998389f77e0c8dce6efd1f65472338a56c86ff459b7a0c8f8f46cde1
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 17520 bytes
SHA-256: 4516b59b61eb9981e8364ffd1fd1409fbf5c9cbe415031a10db8d942d1608e69
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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