Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f741f65621021cf…

MALICIOUS

PDF

109.6 KB Created: 2021-09-13 10:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d95169eba0947f3bafc80a4e0cfdd95 SHA-1: 70e5dff1d189005485f22dab418ff22665205729 SHA-256: 3f741f65621021cffd5238bf871e8b1b18d7bc64f1fa0f0493e63308fcec19ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or distribution network. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a larger SEO manipulation or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bikeid.net/ckfinder/userfiles/files/demorepej.pdf In PDF document text
    • https://slide-bearing.com/d/files/71698122773.pdfIn PDF document text
    • http://intertravel.hu/_user/file/raxep.pdfIn PDF document text
    • http://chieucoingason.vn/files/dutazuzewokazemipe.pdfIn PDF document text
    • http://hongdacable.com/d/files/kurut.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/23848839683.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/36099203033.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/30643172237.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/zagezijalatadolinixepux.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gosudabumelelusam.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/dotimugadi.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/34652634944.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/54378675466.pdfIn PDF document text
    • http://rayer.cn/d/files/zebudazazigisiwugitorilul.pdfIn PDF document text
    • http://keyday.ru/files/files/vamovufekasokunufeb.pdfIn PDF document text
    • https://soechi.net/userfiles/file/12025826569.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/tunoremivagedapit.pdfIn PDF document text
    • http://186086.com/upload/files/janazerajupikotugagun.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/retisuxizavemolixo.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/dorada.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134777dd39fa---23316001946.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/89958554291.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210906060150.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdcb89dd4---lujutipazaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=settings+application+manager+androidPDF 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_off00014897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14897 10932 bytes
SHA-256: 73317a0175db2aa6458e4d89203d831b1f23fee58088d8e108e3151a41319b05
font_01_sfnt_off000161a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B9 17984 bytes
SHA-256: 23cca440479c74f01cbd820c2e5bb0fe5557a7a1c06b806c6a344edd4fa3acf1

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