Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b77b73b8cd35582…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 22:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5bcab67aec41340c3568b59ead6bc9c SHA-1: 75bb0e476fcd1fc668164e57670581e4f5437f9b SHA-256: 8b77b73b8cd35582c6143541b7b770f606cb9f1680cffe5fff11edb1856b63ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and using UTM parameters, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, implying it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=android+galaxy+s7+price PDF link annotation
    • https://bocion.com/ckfinder/userfiles/files/sivaguxaj.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/58393245854.pdfIn PDF document text
    • https://onecre.com/images/content/files/foriboxiwakeduge.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/97441297733.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/19387892584.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163114872791.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/95703649282.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/pimexaded.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/36223584641.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/49590947943.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/60217134742.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138956581811---nepedibutito.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/puhq4a81nu0lje4cgv25i51rg4/26101596610.pdfIn PDF document text
    • https://preciseenergygroup.com/media/zofibipezuxizudimado.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/87896506159.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/nejonawowadiv.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zemobefaxanuzopaz.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/pokewajosixoput.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/vabugiminepo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/19535625272.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/malejew.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/95831383915.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/xuzavitevekigitexi.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_off0000bec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 10840 bytes
SHA-256: f59a94c939ec255bc224bc26258d5f3c1d5f1262846dc379c00578bb20f6f0d0
font_02_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16944 bytes
SHA-256: 3d1bde6d7bdb0aa56bef9e39e128ad375d923a9f8a76811c7f711e6150a27073

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