Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6da3aa462192f4…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 22:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14b378c72999817a4e8ecfeb34693132 SHA-1: b66545ca1b3e4af49ed2f790c96f3faee27cd0e1 SHA-256: af6da3aa462192f4bc2cc17fc53fb1a210c95673155c532234cfd841386b5faa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm designed to redirect users, and the ML classifier and ClamAV detection confirm the malicious nature of the file. The primary goal appears to be directing users to potentially malicious content disguised as free VPN and proxy downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn----otbbfbbknchz.xn--p1ai/sadm_files/18791845189.pdf In PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/54572571605.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/xapiz.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/maminorivafi.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/nirulaxozugapipifa.pdfIn PDF document text
    • http://cssh.es/img/file/lususobawudozaf.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/40527853128.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/76523002559.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/21996295061.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/52714667786.pdfIn PDF document text
    • https://tivicom.vn/upload/files/18494828662.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/burutuwurijuze.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/21729031029.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/51542472525.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210909113123.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/64654081090.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceb2f3d19---81863094108.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/91707750236.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/pativorolizanubu.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/58519573971.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/sevukoviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vpn+free+proxy+apk+downloadPDF 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_off0000b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 10496 bytes
SHA-256: 13aa4bb9c62c4949e14dd6f8a9a7b6d1a9dce71289ecbed46052fd1d58429bc9
font_02_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 15552 bytes
SHA-256: e549cebd31c91203354266b5962df8c2ca87d5d56a2e74ba03ffad6cb58e075c

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