Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bf2abc039355b9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 20:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c98d41cbe34fa6f92f512d29ac4cd65e SHA-1: fe3c8b208e055202032cf6c1fcb50c73a642f196 SHA-256: 74bf2abc039355b9fb75570628356619226bff4607c35fad734cf152cc18a373
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://uat2.hkha.com.hk/ckfinder/userfiles/files/3172208268.pdf
    • https://scalping.ir/data/files/file/30773778317.pdf
    • http://lica-mpt.it/userfiles/files/51279987338.pdf
    • https://ppkh.net/userfiles/file/75495575188.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/99625818261.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321080d1486---92124382488.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/75436607097.pdf
    • http://sjar-tech.com/uploadfile/file///2021091005043696.pdf
    • https://jokerprod.net/userfiles/file/50682524490.pdf
    • http://dgkno.cn/upload/3907946218.pdf
    • https://ikitellirezistans.com/upload/files/77394836449.pdf
    • https://bselink.com/userfiles/file/jijaxuvebuvupu.pdf
    • https://kaunas.cvzona.lt/resources/img/files/15825657120.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/tetopatotalozenutibow.pdf
    • http://manegedebuitenwijck.nl/uploads/file/53867189321.pdf
    • http://hejia-ele.net/upload/vobawejuwamilu.pdf
    • http://gelateriacool.it/userfiles/files/59862842513.pdf
    • https://pjkconstruction.ca/images/file/rorudetinatifolaguv.pdf
    • http://www.klccpa.com/userfiles/file/
    • https://deshpanday.com/ckfinder/userfiles/files/zezajerenuvux.pdf
    • http://telek-trans.hu/editor_up/41475687981.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/59459219463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=shadow+fighter+2+shadow+and+ninja+mod+apk
    • 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_off0000d963.bin
dc354950fa7833d8781503d86cde29323876b1e6bd97c1a517c3fb1b67405a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 19120 bytes
font_01_sfnt_off00010c25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16792 bytes
font_02_sfnt_off0001243c.bin
80e0feaccb12f9fe8c384f6f3bc6353c3989790986ff5d619023094fa3b7c5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 11400 bytes

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