Malicious PDF — malware analysis report

Static analysis result for SHA-256 18564070d234acc1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 07:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd08c59269cb5a49f54ddd7edfbdd040 SHA-1: f849c6a4ea7524c213c77551c93dfc44d5798392 SHA-256: 18564070d234acc1e32641534beeec14e38075d8db403f5a1c868961d7a690f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme, where the document acts as a lure to a network of disposable domains. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=panda+helper+app+ios+and+android
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/bigufupise.pdf
    • http://aqua4you.hu/userfiles/file/dejiduvipikogewanapoxe.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/vimekudazenutopojefeduk.pdf
    • http://studiotecnicoforace.eu/userfiles/files/sazam.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/53740653548.pdf
    • http://modulobase.com/userfiles/file/51309492504.pdf
    • http://air-ned.com/uploads/files/17255624089.pdf
    • http://aesg2edcv.handylover.com/upload/files/pipijefatijoterunu.pdf
    • https://repare-ton-smartphone.com/userfiles/file/6408270641.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/17365981741.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f17771ab9---pamajaxot.pdf
    • http://greenworx.eu/images/uploads/files/25633776060.pdf
    • http://ilkjv.com/Images/Media/files/61348534263.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/292nmh73k2rg8t3scqrq3ijqll/pulugafujima.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/fezujotukotujebef.pdf
    • http://rld-carbon.com/file/depozufevujipuzavif.pdf
    • http://africalegal.nl/userfiles/file/94660864092.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/554147200.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/wugogemelan.pdf
    • http://asiadomainstore.com/userfiles/file/javerasejiwixelumovonorol.pdf
    • http://notar-frings.de/userfiles/file/leputejunip.pdf
    • http://ronaldtan.nl/images/photo/leleza.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_off0000b427.bin
8e5803a200bc919ccf0aef6f13cd749b3721be3096644fdccc6cf32454b72e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 10392 bytes
font_01_sfnt_off0000cb77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 16792 bytes
font_02_sfnt_off0000e389.bin
4aa14d1931acea1221b5e5d34e8f098fad531eb19d32524b19348f0a50039b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 18284 bytes

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