Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b136e6c12555743…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 00:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c1a82fc68efdc0ba09a449c99ac59e4 SHA-1: 9b31aad9350c455c0fe138cad7cd0914294c2a36 SHA-256: 6b136e6c125557436e273328f0fcf30b6c21d7581ad8ce2671bad99d79a4496b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dautuck.com/uploads/userfiles/file/17330225323.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/jokazuzarudox.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/32578735762.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/fixovamepoluw.pdfIn PDF document text
    • http://identik.hu/editor_up/galovipapikinirevike.pdfIn PDF document text
    • http://dobermanncz.eu/files/3865826613.pdfIn PDF document text
    • http://strap.sk/uploads/file/bovofubimigogu.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/68176980261332ca5014a9.pdfIn PDF document text
    • http://ymmicro.com/files/files/kefiranupizizofokipofi.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/42662335633.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/64487339060.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/67586d4af56974d7277754935e7a3fa9/15747166875.pdfIn PDF document text
    • http://scsytech.com/upload/files/67084486029.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/30040630532.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/39442369853.pdfIn PDF document text
    • http://ccshecea.org/upload/files/4645813543.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161354954b9640---runazamudo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/37574566804.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/50786295595.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/68476205155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+free+robux+for+freePDF 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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10236 bytes
SHA-256: 0bd21399323a0069bb21d563b80432af2889935006fb57a1ac30bb8619c638c5
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 17136 bytes
SHA-256: 0d7453677562b1743453494df074afcc80f590e5151ca05ca4358afec6ce88a9
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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