Malicious PDF — malware analysis report

Static analysis result for SHA-256 762b6b9a8700deb2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf9ea9753dc5c89f654d43b524763666 SHA-1: ec44b938398ed6adca4247b006cb0b0e43112b8b SHA-256: 762b6b9a8700deb216bf60c8892794ede2e89b6a0c56d7444e6b0f57c9678624
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links, a common tactic for phishing or malware distribution. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hardiebase.com/uploads/assets/filefile/wowob.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/sifagomev.pdf
    • https://toocapen.com/files/jituvo.pdf
    • https://all-stage-meditation.tw/uploads/files/6133b1d5657f0.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/57767646741.pdf
    • https://webmenuplus.com/images/file/dajaninekomo.pdf
    • http://benevolo.it/userfiles/files/kuditosupurawatabasux.pdf
    • http://villabrown.it/userfiles/files/lidebivov.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/99724734e51f0f794418919bb0581e0a/ranesunilegapu.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/juvejiraziwirisezije.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/rizedukalitivapagavup.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090405525980554.pdf
    • http://nikolabartakova.cz/files/file/jofotifitiril.pdf
    • https://lnpro.in/ckfinder/userfiles/files/lesijeve.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ac05b8a67ee7f5072e403302a54768a9/lonamutiwosekemewemojelob.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/60332554347.pdf
    • https://atlaskvartir.ua/data/uploads/files/60335378397.pdf
    • http://cieplej.pl/imgturysta/file/kotorida.pdf
    • https://elnativocoffee.com/silver/upload/files/rotogumapojurivuvi.pdf
    • http://rbc-bezorgdiensten.nl/upload/pejok.pdf
    • http://happysmilecard.com/uploads/files/bazixamidutudomo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fortnite+download+phone
    • 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_off0000ca83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 16792 bytes
font_01_sfnt_off0000e295.bin
2c789ad88b625f0c39099c976508c66d83efc89762b829535bfc97ce1c944a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 17008 bytes
font_02_sfnt_off00010e18.bin
31d748c9131a7d7f1555d7bbfd2737328bd737d168cbb62277cb02d40ecf16ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 10384 bytes

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