Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfdd4e4b0289df0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 00:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 341c75448b957430935a5f0128dbb695 SHA-1: b4f355e6f3b17d3309b2878be29c0b3dce518cd4 SHA-256: 5cfdd4e4b0289df0a406b6b82c25298359ace8d082bff2aade8948f98e72f3ee
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 flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://otczenacts.com/media/files/jekir.pdf
    • http://swvocal.com/data/se2/file/vunebepikodojowivovisodup.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/30706160373.pdf
    • https://distriparkbotlek.nl/userfiles/files/wulab.pdf
    • http://year-c.com/upload_fck/file/2021-9-4/20210904170627431920.pdf
    • https://copab.tn/216mag.svn/uploads/files/60370964756.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa774975c---75327841340.pdf
    • http://coming-c.com/userfiles/file/57393474721.pdf
    • http://headlinesdinerla.com/uploads/files/5157505759.pdf
    • http://net-marketing.hu/images/files/81989197484.pdf
    • http://pevak.info/UserFiles/File/64457204241.pdf
    • https://luiginoiobbi.com/userfiles/file/7947471815.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5c3c51c9---72164609654.pdf
    • https://iwistw.com/upload/files/fasexapaminonu.pdf
    • http://irinaburmistrova.ru/files/sidigirozipubop.pdf
    • https://led7.ru/file/xobonu.pdf
    • http://rideabikenews.com/user_img/files/38830486740.pdf
    • https://alohasafaris.com/files/xubelirijogoni.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/lusapelid.pdf
    • http://capesociety.ca/uploads/files/loxarebozezojavuko.pdf
    • http://avanti.pl/userfiles/file/sotagazi.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/mujabafivigarej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+studio+import+jar+file
    • 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_off0000d7a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16792 bytes
font_01_sfnt_off0000efb5.bin
1e351d2bfa9ba65f6835290fe2d99d74fa4d82fcd9db078f5654dc5f6820e8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 18936 bytes
font_02_sfnt_off000120f4.bin
ededf3aaa7ad63373200c971fa40c82d4bfb1c7295079cb3c95cd63bb308fe15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 10872 bytes

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