Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7610572157c9909…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 21:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 767402475f7e87291df4dd5ce902c717 SHA-1: 5c9df39ef4288d621dc88eddc96dbb87e6368195 SHA-256: d7610572157c99090943cd5b8227e0027f35a14e5309c67919bdb35fc6ca04d5
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 a large number of embedded URIs pointing to various domains, indicating a link farm designed to redirect users. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://philabc.ru/uplcv?utm_term=chikii+apk+ios PDF link annotation
    • https://interference.ajoda.eu/userfiles/files/57811213045.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/95815546740.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/xejivo.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/82197272510.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/sozaxetanolozaxe.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/aaced0e27b7c763bf8ba9ac94abf5c37/988182318.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/towatobiperinegaradu.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/66776313572.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nugijegelodemironovesi.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/60516853003.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/83603884810.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/85202453253.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5ea95144---79154255875.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/bexafaselilikogosobifuma.pdfIn PDF document text
    • http://artepcb.com/upload/files/wuzowom.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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 9992 bytes
SHA-256: fb718228480772f7e9cdc4fe2f52029e3add5c1d8d8767d4e130d6352b309893
font_01_sfnt_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 21444 bytes
SHA-256: 682c6c8cebcad764243046e124ba22d10222bbc52464b8b3277ad484ed8b6aa7
font_02_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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