Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e668b586cc30157…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 17:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f982e696a6a16d8e19ddf500fe2dc44 SHA-1: 3966bf9f8d9044df2cbb1b7863603dcf2087a2bc SHA-256: 0e668b586cc301574c1477f28a3e5e6ca49e005b4c5a8bd6f7dcfe5736f78ff9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains. Heuristics indicate it functions as a link farm, directing users to external PDF files. ClamAV detection and ML classification confirm its malicious nature, strongly suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jar-ted.pl/file/kokimebalozot.pdf In PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/nejumivusu.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/vovafotomibozi.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/76657981088.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/lezaxixutidubulezenas.pdfIn PDF document text
    • http://simonide.org/userfiles/file/19444004865.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/31552952657.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091822011573499.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fevapewove.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xejigizotinawapekev.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fca59d04c---futovekipimawaj.pdfIn PDF document text
    • http://geoman.cz/data/file/64194235071.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/43301401381.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gejele.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109031650375850.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/72511360622.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7nv1jv8tim1p8ujq83ln0qir4f/tanipevetovoxelaxe.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wujixajewaveweraxekabasom.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/lunixidire.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/bozik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+story+games+for+android+2020PDF 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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 17172 bytes
SHA-256: d8a22d50a8e64661c88e5bb5405a44c9bea6b99498d7f3daceba9e5f8bd72995
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 11060 bytes
SHA-256: 3bd90159fb67849093eb259e907e393c3fce7385ee749803fa46bbb2f783b786
font_02_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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