Malicious PDF — malware analysis report

Static analysis result for SHA-256 484f1edd726b2f16…

MALICIOUS

PDF

93.8 KB Created: 2021-09-16 10:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b29d2efc5c88d2972e2f75390dd05dfd SHA-1: 63ba5f23baa9312bd3653f1220535f5189ae6206 SHA-256: 484f1edd726b2f1619241cbf5862ae3c9e3bbe70d221d0c22b617c2e18455f86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, with many of these URLs leading to other PDF files. This structure, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://baloneacessorios.com/_upload/file///98477932967.pdf
    • http://seoaudytor.pl/userfiles/file/96117027830.pdf
    • http://domplus.su/userfiles/files/28654682315.pdf
    • http://morpheus-architects.com/file_media/file_image/file/sirego.pdf
    • https://clearpatth.com/userfiles/file/nedufetifuxafopugifej.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/67117781890.pdf
    • http://yourmoneyyourbank.com/uploads/File/jarivozoxesepem.pdf
    • https://netiko.fr/img/Data/file/17995201603.pdf
    • http://sicompk.com/survey/userfiles/files/97492376549.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/92045164315.pdf
    • https://mmoxx.mn/userfiles/files/pijugene.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161337a11da462---46549560546.pdf
    • http://martonaroniskola.net/userfiles/file/14681679096.pdf
    • https://afgventuregroup.com/cfiles/file/tasozutozida.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/4405875580.pdf
    • https://kisikana.hr/UserFiles/files/rufev.pdf
    • http://bnblspecialities.com/userfiles/files/38931849376.pdf
    • http://dorp.pl/userfiles/files/pudozavas.pdf
    • http://cl-pub.com/files/files/63243939551.pdf
    • http://hotelniagararimini.eu/userfiles/files/58716916306.pdf
    • http://ellev.fr/upload/files/39645597929.pdf
    • https://aathichudi.org/userfiles/file/wonuwerofiwowasudap.pdf
    • https://pioneerlift.com/upfiles/editor/files/40351591798.pdf
    • http://biosurfest.com/userfiles/files/jeriresojopaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+supernatural+childbirth
    • 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_off000107c2.bin
101fac90b8fbfed24910c118b59bc415ca4c562d4d5d4327d1d3816b19d2b7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 18480 bytes
font_01_sfnt_off00013845.bin
bcdf00db90cfc41c830b06d18bb619970d8ffdc328b148eb3bae954c6f0ce255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 10936 bytes
font_02_sfnt_off00015165.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15165 16792 bytes

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