Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80c4be898ccde02…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 11:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 132e6ca182a0a3b274c22aa33d58f90c SHA-1: 3eb265a3eedaf5a29eff60427b3cee9a0e040f95 SHA-256: f80c4be898ccde028071baa027b537e8d6b02163f3b3901643ff0c5003482922
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=nelson+mandela+a+long+walk+to+freedom+pdf PDF link annotation
    • http://champaigncursillo.com/userfiles/file/86742850669.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/77284352366.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/xarewupibopenuv.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/18509438722.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/togutapojujazoxewogol.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad6435a33d---37785939367.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/zisazefabuzoti.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tapejan.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/50577498275.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/xufotubesabijezetu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c931712bc---47549480513.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/muzum.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/45091026971.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/88523849131.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/poxevosomuralaruz.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/80323026685.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/38086691795.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mirikojedowinesipeki.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/25303845613.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/49652399383.pdfIn PDF document text
    • 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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 18172 bytes
SHA-256: 87eb79bf6f57e4e87f2c8a70cb0efe914d24ce9e74799d66f852d890fba8935a
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 10904 bytes
SHA-256: a8cc2acfa4f5312605424f5516ae9ab93410ed6383437e2c9196e62e650dba3a

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