Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d241ce46a55ade…

MALICIOUS

PDF

111.1 KB Created: 2021-03-17 07:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53281f11fd26d7c8be5518ff5e6a2d8c SHA-1: 6ee6080fb9a24074e4e5e70820542af102cf9ca2 SHA-256: 31d241ce46a55adeaacfc0fdbe898dd8fff2951ca0fd1ef2a9edaa2b342edb4a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a potential link farm for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/123?utm_term=california+ceqa+guidelines
    • https://cdn.sqhk.co/sadoburola/eIaiWgi/77140418733.pdf
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/1403419.pdf
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/b41fb.pdf
    • https://sogifeni.weebly.com/uploads/1/3/2/7/132712483/08a947c.pdf
    • https://cdn.sqhk.co/wesifarajaru/O5hhjib/ratodinakefozoruraxate.pdf
    • https://cdn.sqhk.co/wamiratena/bmajhEw/kawubix.pdf
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/gelevesa.pdf
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/e76b25fb9.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/3711882.pdf
    • https://cdn.sqhk.co/zegetaru/fEEidje/first_milestone_parent_connect_app.pdf
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/jekov.pdf
    • https://josusijino.weebly.com/uploads/1/3/0/7/130739082/e91aab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/314bc437-1462-48be-8bfd-d766cd5f6e09/database_administration_fundamentals_course.pdf
    • https://uploads.strikinglycdn.com/files/d1d6e6c7-fbab-4b94-b260-cc2a95cfe4b0/74046024675.pdf
    • https://uploads.strikinglycdn.com/files/cc6aff00-cecf-425d-bff7-30d444bbd464/sheriff_of_nottingham_disney_voice.pdf
    • https://uploads.strikinglycdn.com/files/f85c64b2-0dba-40cd-b605-41bf7dfc0340/2005_ford_escape_pcm_problems.pdf
    • https://uploads.strikinglycdn.com/files/0feae2c6-7583-472a-b296-3f29b938e309/zivapotagirugebe.pdf
    • https://uploads.strikinglycdn.com/files/6b154e05-0ab2-4e65-887c-f3cd95b589ea/5777840500.pdf
    • https://uploads.strikinglycdn.com/files/9f80c676-7f9a-4919-90e2-f58114e412c5/22246190779.pdf
    • https://uploads.strikinglycdn.com/files/616294f1-ecb5-4e33-9953-328c9e4812f0/osrs_ancient_prayer_book.pdf
    • https://uploads.strikinglycdn.com/files/3a4ce5bf-0991-4b0f-a49e-cc92b77e60c6/89041684244.pdf
    • https://uploads.strikinglycdn.com/files/2c989d8f-6d33-43c5-83f3-f61063e2f0a6/2008_jeep_wrangler_4_door_soft_top_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/939b0898-3302-471d-afaf-ac376425e970/chess_tactics_puzzles_apk.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017436.bin
0758e71114e8231a7d6b9a95feca61ded3e1b7e9638bb142fbd9254d3be32fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17436 5220 bytes
font_01_sfnt_off000185ff.bin
c2cb901e1eea999a30e7c71384a5c76f0f5e7abb94930090c2dbd790e0b1e32f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x185FF 11564 bytes

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