Malicious PDF — malware analysis report

Static analysis result for SHA-256 696702e0137c3ee4…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 16:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 24ca5a05732ce72766be9b783a03ed67 SHA-1: 0fc039aaf1ad3c2a08c9d2d5ca635dc271b8c8a8 SHA-256: 696702e0137c3ee4227fead2df01533bec2e8759514ca09366e714e622f95303
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm on disposable hosting, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/68536119705.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c04760d2402fda736bc155029253dec8/73874703021.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/zuforariwo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/69487313690.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/bikunulopisomomarexes.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/wowumazaxelek.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/88498765367.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/35702322990.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/dofiriwodijezalad.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210901/file/16304557763358.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/wogapowibus.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/35215934005.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/tomijetigulogusowojuxe.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/bokitiroxaditudanoj.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nefesujagetemigogirojid.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/nanikerugilop.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090513295073499.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/80625818239.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wopozifekotesowerune.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/jedogor.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/44559825222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=compare+samsung+s20+and+iphone+12PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 11120 bytes
SHA-256: 7ad5760bf6ba5accbe4df0e74626254392406fdb86a50ec60e611fefcded4186
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 18400 bytes
SHA-256: 35bc9f02429e58bb7a9a923fc59a67f78eaee797d0faa981c04ba98dd9a60ec7
font_02_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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