Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f08934359f2e33b…

MALICIOUS

PDF

94.2 KB Created: 2021-09-10 03:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 002a8edf1a9657ec719b0ddfecac55aa SHA-1: 5c8b367420ba13a38429e3756ccf5166ac3efdb1 SHA-256: 5f08934359f2e33b6f48612d3637ad837605356910de62a1fb7e4422a6720e4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wfca-czech.cz/temp/userfiles/files/xukomepupokezusakewozufo.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85b91160a---lotiwi.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/fekojazapito.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/62969758868.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/86370970452.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133100e27c01---2921178008.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wanotafajoge.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/20310874790.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/bobutirim.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/dofisurowunalesij.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/47264936713.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/jaresowixaxawomuwar.pdfIn PDF document text
    • https://greenways.at/userfiles/file/xuxudivoxoturo.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/10296254306.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/vusixunavigopefedokofajur.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/43310689124.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zodusefojetobulalanijan.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/domapumemixologadoduj.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/rumeduzefipanuse.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/62551095904.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/5036695358.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/291033238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+robux+generator+no+human+verificationPDF 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_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 11068 bytes
SHA-256: 92fff1ce8bf1fc511a91d011a5fb549d3cb92abe03279577f87698dc85bbddba
font_01_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 18264 bytes
SHA-256: 20e3b0aae52159ec845b3e1297401b314a5acda381a1df5a92f7df29e0057694
font_02_sfnt_off0001530c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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