Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b94bf0bd0f006b8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-10 04:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 088b4f65c51a6b0d3dac03f8b869bd26 SHA-1: c72573ceb7e4ad22f6868dd7df55b1d41022e7b1 SHA-256: 9b94bf0bd0f006b8204f8378dea4179e002f0a66aea99c0b392ccd5585d7c78b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://shiokuda2.com/contents/files/vemamukobawupudi.pdf In PDF document text
    • http://fioredda.com/userfiles/files/61259769690.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/71611027207.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/7841970104.pdfIn PDF document text
    • http://newmob.it/userfiles/files/badefipefuvepifivaf.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/bejexorijan.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/51038895769.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/63614704290.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tobegagobituriwifowi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/zudegavoxofapor.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/xedudiwutuzo.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/dalofafekot.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wesenevalubunalek.pdfIn PDF document text
    • http://eternoohydro.com/d/files/devizaxi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab509e330---dunafewijemoneritaroje.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/36894425252.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/sepixobawixovobena.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/6897328341.pdfIn PDF document text
    • http://kezmosas.hu/files/file/kigazodisapobulimu.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/58111908637.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xuxebuxiremazurudurefi.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903032500106.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kekabulana.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/40904710695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=i+love+myself+quotesPDF 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_off0000b8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FD 10296 bytes
SHA-256: 1323b4afe25f7bcd8a0a6e0cefa502df4f95a4ea459b55a3d58723980cb59753
font_01_sfnt_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 15796 bytes
SHA-256: 86f2dd2b18e8155ec367038518c94309b96655c4c3d72fc71691fd2a346b3d5f
font_02_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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