Malicious PDF — malware analysis report

Static analysis result for SHA-256 b796233a07300f0d…

MALICIOUS

PDF

81.6 KB Created: 2021-03-23 09:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb30b27e60326943a43d823f577ddc5 SHA-1: 79ded2bcea9bd7aa3a3ea4bfd0f01095dfc05c87 SHA-256: b796233a07300f0df62e9b8c1c5fcea0dac030cf1f7ee2758677ffbf58c10bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being https://mezovuduw.ru/wix?keyword=how+does+justine+die+in+frankenstein. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or SEO manipulation attack. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=how+does+justine+die+in+frankenstein
    • https://cdn.sqhk.co/wunokebewoz/SggieoE/94015242542.pdf
    • https://lokenomosotim.weebly.com/uploads/1/3/4/4/134499182/feb71492b283a.pdf
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/3988959.pdf
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/tuvawadezet.pdf
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/9442911.pdf
    • https://cdn.sqhk.co/kafexobesa/ii4jbGr/download_redream_roms.pdf
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/4402345.pdf
    • https://cdn.sqhk.co/dinigivo/zhh9qvn/galaxy_bug_space_shooter_cheats.pdf
    • https://cdn.sqhk.co/zimamoko/mTV2s2r/movie_the_lion_king_2.pdf
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/xesevaxelut-solebox-mubixakemakov.pdf
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/08aaf7e169a78.pdf
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/sawetuzal.pdf
    • https://pazelofigo.weebly.com/uploads/1/3/4/5/134588761/2a8ddf.pdf
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/075d3d4e2bf.pdf
    • https://cdn.sqhk.co/votojuxosaf/i5idhhd/23069423177.pdf
    • https://rezilatepupegox.weebly.com/uploads/1/3/5/3/135318796/5463187.pdf
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/7e7beae0602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_b731b29626f44037819058f15696f097.pdf?index=true
    • https://uploads.strikinglycdn.com/files/057941fc-4ab8-434a-b136-7db0ee0eaa5d/92594166171.pdf
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_19ca02a629674690b8e4a3c14d9abd07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d024618-98be-4a2d-9c4b-a09b7b5e3f2f/how_to_get_a_spanish_translator_certification.pdf
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_a9abc35264724419b57709862a3993f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/24c3465b-d6a0-4cf4-81da-0580f8385c93/best_essential_oil_recipe_books.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_090b15e629c04edf80cb47d7b23be65e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee2cebb4-3d59-445b-a03e-b307236f4ef8/98134355936.pdf
    • https://uploads.strikinglycdn.com/files/838e2025-04f3-4b47-8327-029305aa6711/21758964632.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_49ca1af974054b06bb6b92a72074978b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c0.bin
c79a457f41463ba28eadce1ef5f156967ec5e0ea13642ac646425397e8be275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 5064 bytes
font_01_sfnt_off0001151a.bin
3d563d58adba1dbfb645708a490a4cd3ae2d89ef848d868ae5f0946b65ccf5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 10400 bytes

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