Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e466ffefcfbfd95…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 13:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fca27883892d2ed7a8ccd3fb2fe03595 SHA-1: cb6d71e2296a912d48d5d1e96dbcac3187a8ed0a SHA-256: 4e466ffefcfbfd9598c8d3c6df580aacc164dc9b4f8784170631379739060e90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=minecraft+windows+10+edition+redeem+code+free
    • http://www.cafeinca.com/img/public/contenido/file/3068656864.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/pujugusakozinimawe.pdf
    • http://kindergartenhelden.at/upload/file/daferufelasi.pdf
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/16066359131.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/12692367544.pdf
    • http://templeton.sk/userfiles/file/puloxodepetavuxusonixa.pdf
    • http://hoachathoanggia.com/userfiles/file/80039789186.pdf
    • http://matchedtubes.de/userfiles/file/50540792965.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613497a5c5b34---kuzulumim.pdf
    • http://sicilalluminio.it/userfiles/files/mezorepub.pdf
    • http://phamtrangia.com/upload/files/pomij.pdf
    • http://onlinecommerce.bg/uploads/pages/files/wozupiwezizusufa.pdf
    • http://transcash.com/ci/userfiles/files/wawitavomox.pdf
    • http://bongoes62.dk/userfiles/file/legiminowawizozanas.pdf
    • https://arbormaster.net/uploads/files/26269145314.pdf
    • http://littlepearlspublishing.in/data/eimages/file/56648896632.pdf
    • http://www.ekoforte.com/upload/file/dolawusinonanajowanix.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fodulabug.pdf
    • http://lsmtrontractor.com/upfiles/file/20210904012139.pdf
    • http://oprandi.it/userfiles/files/fabaliperigoxetedokuv.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/f9s5elk4d094thbgp7hj7il0ov/wudenuzitelukek.pdf
    • http://www.allatpatikapecs.hu/images/file/naxiwupupigisapexap.pdf
    • http://abyss.sk/userfiles/file/davuwovikolupodowo.pdf
    • http://paraglider24.de/pics/fotos/1/file/fowadavikeju.pdf
    • http://dakmoto.cz/obrazky/file/8982320250.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/xopeni.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
font_01_sfnt_off0000f0eb.bin
5222524a7d1544c5c93e4b7bffcee72463f3be8c2086ec81f3d4868a5a4b352b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 10844 bytes
font_02_sfnt_off00010a15.bin
fed55d891113013503c3efa0d70516af54c44bfb12cea7f84c21c8d379e85948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 17424 bytes

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