Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bc312a2717f204…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 13:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ccc5a879aa3b96963b1bb48b9bd19ca SHA-1: a58d002f8b943cc163df28bdfa00e0cad4671b6c SHA-256: a5bc312a2717f2042bc7820725b23d20fba19f9e4701ae834711b6ab3b2b8466
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it is designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bycongroup.com/UserFiles/file/78502627304.pdf In PDF document text
    • https://beamstraffic.com/amb/userfiles/file/18257743276.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/75caf83623dd95ea45ce4fbac0df3fe7/45288083617.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/loremavawagabalaninav.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/35730219555.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/47475244283.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/sumivenagerikaxisuxata.pdfIn PDF document text
    • http://healthywithhart.com/res/file/tumutape.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/36056027598.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/fisowutejoximefodubug.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/43567810777.pdfIn PDF document text
    • http://kustari.net/userfiles/file/95499001169.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/28680291350.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/nubuxepelozivexokises.pdfIn PDF document text
    • http://blueyee.com/upload/file/21072243135.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/bafuxitoraxosasa.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/85692207721.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fubanexesalezutatet.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/dalil.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/jipubarazubidil.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5a996549762ddfb35bec75df9b6f4d00/25939751512.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/7850657425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+sd+card+permissionPDF 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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 17420 bytes
SHA-256: 568e8532a5b105206af70f9fd60c51bf52026e1ff09fad0a383338392abb5c45
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 10888 bytes
SHA-256: 4e56b6e350c6f02e56676119152d5aa6636380d1c26e9ba956be1b9c1318e940
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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