Malicious PDF — malware analysis report

Static analysis result for SHA-256 9194c80aab6a11c7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 14:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e037288047faa988ef160f9a9c71cb23 SHA-1: e5d88c7448ecf48dd77fc5bf0f6e3066f6824a82 SHA-256: 9194c80aab6a11c7c1b3c821b813bd0d9634a4377fa72a18cf90403b1546376b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest the primary goal is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=android+security+internals PDF link annotation
    • http://sinostandards.net/upload/files/wenafajakewetuxego.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/dutizewunepavupep.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1fva7hhhi09jl0884n66h96lt4/talikog.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/59549817003.pdfIn PDF document text
    • https://media-get.com/userfiles/files/visikone.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/wevulenab.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/20963169656140753742546.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/58182223824.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/vuwudukubowekuvulirebetit.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/tawatawo.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/konezenuvewofepabej.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mawatinaporexi.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/tupuvepepuwavu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/70421170079.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/64696966773.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/7197596724.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/77299643476.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/19318897353.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/xudowaponiretezobevu.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bimonutulasefavod.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210902111754.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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10560 bytes
SHA-256: 4c6a60e76ec659ab721d52fe16a7beb93c0f5b4e950d3053bec6f2520eae63bc
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 17624 bytes
SHA-256: 0fb1865010b78056a849a2536a1952845dcaa34a3870b5d6de4fe8e1c5dc466a

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