Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d439c54a5a7e9c5…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 02:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6094b23c167dfa74ad74bc1e9e35615 SHA-1: a1d915902ffa87da98e1cf8adf8b9d0710a2d3a6 SHA-256: 2d439c54a5a7e9c5318f546e3b65215aea8181940461457b8cc24ba2d2acdff7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, with numerous embedded URLs pointing to potentially malicious sites. The presence of many unknown reputation URLs supports this, suggesting a phishing or malware distribution attempt.

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 http://vo23.ru/upload/file/75028169956.pdf In PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/11941289933.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/kakanemakido.pdfIn PDF document text
    • http://silver1979.com/upload/file/22084886368.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/73936100758.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/zofizobetemukel.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e0e1963b9c807da2d4b77ba6461732fb/71908262375.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/xaxuvagikaxajokiwometiw.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/bowukezijubasovijupano.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/janijamabajule.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/jomud.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/givapupiwexo.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/8737356054.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/51996200348.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109091902158285.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/sabivipujasajobufudelo.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/pamoloxabufolixiwaketuvu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/8621532604.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/didojojajovit.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/45262231403.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/35385025233.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/notesab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=no+gun+mod+mini+militiaPDF 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_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 10268 bytes
SHA-256: a2adbf85e9cd8ab24e8cd02b5941da6379824de6fb003e54c017e4864b15958c
font_01_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 18716 bytes
SHA-256: 4c3fa88c2b8336e6f168cc2d679c2e4e9f2c2a541a3c7d72893bbc0ba2d0cdf2
font_02_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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