Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e217a7866a82cd9…

MALICIOUS

PDF

90.1 KB Created: 2021-09-19 08:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9963831070d0b1d828bdcc94dea3154 SHA-1: 695f5532f7a30727bd1bb1d1412b49972de8fc7d SHA-256: 4e217a7866a82cd9bb878f4ef84ff0b827ea70325ab1f83172df12ca46d34c8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://custom-mugs-factory.com/uploadfile/files/95333916770.pdf
    • http://dental-forum.ru/userfiles/file/58458219223.pdf
    • https://saikekanglun.com/filespath/files/20210909031212.pdf
    • http://scoutpate.com/userfiles/file/banizew.pdf
    • http://www.vandiestbrandstoffen.be/uploads/files/27449914657.pdf
    • http://giasudaihocsupham.com/Images_upload/files/3589881035.pdf
    • http://modernplating.com/userfiles/file/likop.pdf
    • http://imhome-listings.com/userfiles/files/82749882624.pdf
    • http://kfbma.org/files/fck/file/43833698254.pdf
    • https://ferropula.hr/files/77327296171.pdf
    • http://eptesteplelek.com/uploads/file/fizaw.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdf
    • https://27061010.com/uploads/files/202109181836224985.pdf
    • http://dgxzz.com/uploadfile/file/lesarezipewiwopemef.pdf
    • https://tumsad.org/img/editor/image/file/54100905530.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/69733711076.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83f35dff2---soropu.pdf
    • https://zaindu.drogomedia.com/files/galeria/files/tesogudodofugakap.pdf
    • https://kotata-zlin.cz/obr/clanky/file/fakojitugurelivizixa.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210904_093B71CF2B12F910.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/kulini.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143960d80270---tafezodidul.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/97861018233.pdf
    • http://tryinvest.eu/userfiles/files/47381700036.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+5+money+glitch+2020
    • 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_off0000f9fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16792 bytes
font_01_sfnt_off00011212.bin
fe15990205c4cd5d7e8a80529ae07c1222854bf1f0f57a9082e18dbe11848eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 10940 bytes
font_02_sfnt_off00012b53.bin
5838d1d847f714fae7fb7eadd479755df0d08cb90e2d0a05f48750fff424aade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 18484 bytes

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