Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e2bd0ea9e4635a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 01:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37b4ea73c4a1117c6e26831619f8e41a SHA-1: 59969fbf1b4634004bcafb665d3be1890d94ab71 SHA-256: 36e2bd0ea9e4635ac82f669b170b4bb37b0f765c7d33a946715da614e51f80f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many low-reputation hosts. No scripts were extracted, but the overall structure and heuristics point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://giasuthienphuc.com/Images_upload/files/fegagilenawekez.pdf
    • http://w-mill.jp/images/file/buzodopimibimanirukavowi.pdf
    • http://pasaru.com/upload/files/nosatomo.pdf
    • https://filetorme.com/upload/files/43256683401.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/80268050008.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcfff0f3a8---retisegoru.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d10066883---62548401708.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/63758708223.pdf
    • http://www.ih-consultant.com/ckfinder/userfiles/files/lesufanuvex.pdf
    • https://mountmoriahcamp.com/media/40261410467.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/54490473521.pdf
    • http://sooam.com/files/fckeditor/file/9214109936138861b41d97.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/nesolureladexabefobowikas.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/96198328256.pdf
    • http://4998horo.gmmwireless.com/contents/files/safaguwo.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/tafat.pdf
    • https://redac.ch/upload/tapafujutuxev.pdf
    • http://twozonechickenlasvegas.com/uploads/files/52711975946.pdf
    • https://samsungdvm.net/upload/ckfinder/files/7185013043.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/77448080778.pdf
    • https://manorhair.com/uploads/files/202109100956171346.pdf
    • https://motelandratecuci.ro/userfiles/file/meranavis.pdf
    • http://egitara.com/upfiles/files/64031536152.pdf
    • https://shinko-tw.com/UserFiles/file/56551285048.pdf
    • http://fzsvybbs.at/userfiles/file/xuwiwubupetenapedogabo.pdf
    • http://fundacjahfg.pl/upload/file/70636631094.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rbx+ninja+promo+code
    • 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_off0000b9db.bin
98747a9928304ba863773d37f293d544e2d50cc6f3a6d6c71e7c80562be0cbf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 10780 bytes
font_01_sfnt_off0000d262.bin
9b4660c13d764bc11739efe1ff1ffb07c2a57d4b96af7c11d6131d56cf33753c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 18036 bytes
font_02_sfnt_off00010022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 16792 bytes

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