Malicious PDF — malware analysis report

Static analysis result for SHA-256 954da729bf66887a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 21:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f955d7b645e0caee39ed9ef242227406 SHA-1: ffec9859f85a5e0f3c9630e33db69f8cc63afb9e SHA-256: 954da729bf66887acb58f48137aece47fa762297659b281d4e6b828543f18b89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the true destination through numerous redirects and disposable hosting. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/85550713641.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/17262406370.pdf
    • https://svltv.in/userfiles/files/wowenewonedawuverure.pdf
    • http://pieseclimaauto.com/files/file/50191315500.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/kajasizudugunazumi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/lilamobaganeputazeliwuk.pdf
    • http://baodieptailor.com/uploads/2021-09-08/images/files/lowinamejefokarumu.pdf
    • http://moonlightmontessori.com/upload/files/86773241406.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/16257966493.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7b349771---17627128286.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/vixemoxifomutopavafobuko.pdf
    • http://4x4autok.hu/userfiles/files/gafel.pdf
    • http://pronobile.de/catalog/file/xoluvimepuwawevomode.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisiviwuw.pdf
    • http://alibabashipping.com/userfiles/file/nujoragi.pdf
    • http://asesorgubernamental.com/images/file/85671425824.pdf
    • https://pleasanton.com/wysiwygfiles/file/bujanowudezewalinuwone.pdf
    • http://hongpakthai.com/ckfinder/userfiles/files/69018797439.pdf
    • http://thekitchendesignstudio.org/uploads/files/rovegirofu.pdf
    • https://jamuiboe.com/webroot/upload_media/vemizun.pdf
    • https://oncetrabzon.com/resimler/files/28762551195.pdf
    • http://laboratorioshamalab.com/userfiles/file/67462663395.pdf
    • https://subded.org/userfiles/file/21987634370.pdf
    • http://popmetre.com/news/files/fipedogafitimezemotenif.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/54954922611.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+unlock+at+home
    • 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_off0000cd9a.bin
1cdf72ae3af22a9e5aa47a9dfeca77ce5e4f4630ef33e9a13acfc6a96e110df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 19228 bytes
font_01_sfnt_off0000ff08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 16792 bytes
font_02_sfnt_off0001171f.bin
45293512b73238c224a2524d5a90e9c140620c1cd4e97fd31ac75dba577bb39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 10640 bytes

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