Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4ad2959be2a906…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 18:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d3448bd4e680ebdc9b1b221710d417c SHA-1: af33349bab31c080c8a7ed054a8cf2dbf711cd86 SHA-256: 3a4ad2959be2a906b7b7f9f9aaee403df34f77e568589bec087ad960da41f192
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URIs, with a significant number pointing to potentially malicious domains and even a raw IP address. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://hazeloyun.com/calisma2/files/uploads/59170844810.pdf
    • http://greece-ex.com/images/blog/file/wofuwexabamadiviji.pdf
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/35856493214.pdf
    • http://studioagm.it/userfiles/files/9187470639.pdf
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/lobebolodixapewovun.pdf
    • http://185.33.116.145/~acus01/upload/files/zagiwajufujetewuwire.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d525bbdb0---rebetizut.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/21065227355.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/kanelifixovewofik.pdf
    • http://novichiha.ru/pic/file/damibadibamedinumewemiza.pdf
    • https://ctcitsupport.com/media/files/60450222673.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/37302577243.pdf
    • http://mastervgtour.by/var/upload/file/49218081765.pdf
    • http://noithattamphuong.com/upload/files/49844386160.pdf
    • http://myhomeinparis.com/userfiles/files/puluzojijekumas.pdf
    • http://spiregene.com/image/files/20210905_064424.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16139c41e24220---46384508858.pdf
    • https://tennis94.fr/img/pics/files/30412361284.pdf
    • http://dailymaydemtien.com/userfiles/files/tagokepasifukufarukoj.pdf
    • http://cafehinglung.com/uploads/files/jebudukeludup.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gidusowonifadi.pdf
    • https://km2804.com/ckupload/files/29271664912.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=granny+game+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_off0000cf78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 16792 bytes
font_01_sfnt_off0000e78f.bin
39338f0665476ef8aa703ab6ef97430c9ec25620940b54c332f49a7289d19b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 10316 bytes
font_02_sfnt_off0000fed1.bin
4a77c55e50e11b05c8f7598acb5908d3244cf6cb6f188d083cbf4d4fc80c092a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 16936 bytes

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