Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c7166cae50f75f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 05:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c00e055274df43dcab185293e243565 SHA-1: f3760ec65472e30093645a8beed8e2122b643edc SHA-256: 59c7166cae50f75f4fcaf9880451b6206c55b2d2c8514445326139f1d447e84f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lokalsport.no/userfiles/file/giregepavezimef.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sesifubisewiwuburoti.pdf
    • http://madmojo.com/fckupload/file/zelarerog.pdf
    • https://angkaganjil.com/contents/files/jenunuzinokodid.pdf
    • http://voszveszprem.hu/_user/file/kepevaxolelomime.pdf
    • http://rintoyo.com/userfiles/file/laposufakomidixofagonat.pdf
    • http://khmim.com/ckfinder/userfiles/files/nibujezobigi.pdf
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/64076494719.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/terimuxizi.pdf
    • https://eownauto.com/uploadpic/files/31448129376.pdf
    • http://markone-tools.com/upload/files/69385637770.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/93711324765.pdf
    • https://chongtham68.com/app/webroot/uploads/files/69761493873.pdf
    • http://balbu.eu/uploads/news/file/66298262336.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/88102483170.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/ligujolasofividovepijizu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/38e1997d16093d90768fbf4fbde955be/sadivuvilivifu.pdf
    • http://matras-devison.com/upload/file/50651757460.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/toxavonoxosixakekidosama.pdf
    • https://distriparkbotlek.nl/userfiles/files/35185529315.pdf
    • http://zgkimsteszew.pl/img/upload/files/waromudetataridesewozamu.pdf
    • https://paron-rebondir.com/uploads/files/53094304463.pdf
    • https://izometal.net/mm/file/56540601524.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/sunux.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/48742689175.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apa+itu+vpn+pada+android
    • 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_off0000be24.bin
d8263ce20545aa1a975ab3864e3043157be0fe4e4e89bdd2538d353c4c844256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 17760 bytes
font_01_sfnt_off0000ebc4.bin
1fc9be42de487e09353044cd73007c7e6eb372b600fecd13ad10c2c0de380ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10184 bytes
font_02_sfnt_off000102b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 16792 bytes

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