Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fcebbdbb538630…

MALICIOUS

PDF

89.6 KB Created: 2021-09-20 03:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfdf7cb08534c14e3ee437f3282f9375 SHA-1: a354b00099a908b2d7798e23a8278ff8c640c134 SHA-256: 60fcebbdbb538630a47efd883ed2747f0711e1f2daa148ed3e8f39c56da1c349
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a campaign to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://3suntech.com/UploadFile/file/20210914124328096.pdf
    • http://msslink.ru/userfiles/files/bireturize.pdf
    • http://www.ufolep-69.com/contenus/files/pijimirapujebotekari.pdf
    • https://bodymason.com/user_uploads/files/80501481693.pdf
    • https://iqmuseum.mn/uploads/files/48749839173.pdf
    • http://planao.com/ckfinder/userfiles/files/8990333190.pdf
    • http://bukharageorgia.com/sites/default/files/file/34214061355.pdf
    • http://hopkim.vn/upload/files/rogufotoxemorebitisebused.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b1gm7c9ugb45rvojpdtr9rgck4/29059323425.pdf
    • https://dolaodong.com/userfiles/file/34925242458.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/5097300674.pdf
    • http://aybar-gallery.com/userfiles/files/94078083668.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/mivupeparitakesozemo.pdf
    • http://slmj8.com/data/userfiles/files/netatufijalubufovemufil.pdf
    • https://togeltop.net/contents/files/naxazagakita.pdf
    • https://rubenoferro.com/userfiles/file/zavijavex.pdf
    • http://redigonda.it/userfiles/files/patipiteliwivijigonuboz.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/76097069463.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/konex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=abp+news+live+tv
    • 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_off0000fab6.bin
66530fe65a63c34551ccd122ed1fbfa2e7af4f087329f852a8e9faab0e25b055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 18620 bytes
font_01_sfnt_off00012aaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 16792 bytes
font_02_sfnt_off000142c1.bin
f576a477c590557b8ed64a57e1c8e1496a1d4668193b6f76eea7f3b12d61f003		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 10136 bytes

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