Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b97479ed9803a…

MALICIOUS

PDF

82.4 KB Created: 2021-06-13 08:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef938059ce8cab7a527b70bfc742b595 SHA-1: c3ba6b5dab52c6206815534742a8b53baceb16a5 SHA-256: 8c4b97479ed9803ac9ce097298c9ffc38c6e30099a6bc57f67295658d1ca06a6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, possibly to host or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://botokaw.ru/123?utm_term=bedsheets+embroidery+designs
    • https://static.s123-cdn-static.com/uploads/4377401/normal_6005b0fb0e857.pdf
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fd60e8973f59.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_60c59ac6b6b60.pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_606e5732d2406.pdf
    • https://static.s123-cdn-static-d.com/uploads/4373517/normal_60b18efdf1f59.pdf
    • https://cdn-cms.f-static.net/uploads/4491686/normal_604d4125579ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rumusapage.pbworks.com/f/99805150166.pdf
    • http://silasofinat.pbworks.com/w/file/fetch/144660642/tisumefopatum.pdf
    • http://wasazejis.pbworks.com/f/58643131913.pdf
    • https://uploads.strikinglycdn.com/files/9468f061-7c69-4a3d-b93f-dc62382efdf6/rizonovosezubup.pdf
    • http://sekodegaxex.pbworks.com/f/44609654728.pdf
    • http://sulegiwi.pbworks.com/f/dubezikedigexepusop.pdf
    • http://kakexigodelo.pbworks.com/f/defujaza.pdf
    • http://jutopar.pbworks.com/w/file/fetch/144654927/letter_of_intent_for_turkey_scholarship_2020.pdf
    • http://zukitisa.pbworks.com/w/file/fetch/144773811/nate_the_great_goes_undercover_questions.pdf
    • http://zeratuwolima.pbworks.com/w/file/fetch/144647085/bujojivebipeduzaderu.pdf
    • http://tukufidanega.pbworks.com/f/batman_the_dark_knight_movie_hindi_download_300mb.pdf
    • http://mawasuwov.pbworks.com/w/file/fetch/144914730/zorusotakatuxi.pdf
    • https://uploads.strikinglycdn.com/files/3b9f6ba1-9ac3-457b-aeea-8b695ec98deb/what_credit_is_ap_seminar.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144423537/wufomawowenabujaxubuko.pdf
    • http://zixawedeg.pbworks.com/w/file/fetch/144931032/81986934145.pdf
    • http://nilanom.pbworks.com/f/62152078654.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000ef02.bin
2d3c17243753ce665c6835fcd7b95cae20674576ecaa7032d4615a844bbb52a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 5288 bytes
font_01_sfnt_off000100e0.bin
6ecba88ffd97d8c5c1c549929b04638a6324b4b83c6fb943dbb3935adcf505d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 10688 bytes
font_02_sfnt_off0001257f.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 16164 bytes

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