Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe8609dfcbb5b98…

MALICIOUS

PDF

68.3 KB Created: 2021-03-11 16:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad3ca15673993daf71c34fd7cd111b87 SHA-1: 9a37bc777d0378f34d2a3308324e733f5d14f02d SHA-256: dfe8609dfcbb5b981f08bc6e6bf9cc039324599c2863f2befe77d817185c9139
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing operation. The primary URL, https://jumiwimov.ru/123?utm_term=full+stop+and+question+mark+worksheets, is likely used to redirect users to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=full+stop+and+question+mark+worksheets
    • http://domifonupesif.iblogger.org/5-3_theorems_involving_parallel_lines_answer_key.pdf
    • https://cdn.sqhk.co/bowevuva/6jeiiii/tufivivotoluxudonemasa.pdf
    • http://laulu-go.ru/friendship_album_songs_in_telugutvygj.pdf
    • https://cdn.sqhk.co/pajokiman/dhiifjc/jelly_slice_recipe_christmas.pdf
    • http://marketitaly.pro/on_course_3rd_edition_skip_downing_downloadcn7nt.pdf
    • http://daddytestit.xyz/50603186940rfy8w.pdf
    • https://cdn.sqhk.co/bodevoposuji/1eg1tFb/piano_man_billy_joel_lyrics.pdf
    • http://timecodes.net/noco_genius_g3500_not_charging28qnc.pdf
    • https://cdn.sqhk.co/xejoxoka/IdifhdL/arrowood_golf_course_reviews.pdf
    • https://cdn.sqhk.co/ketifoseja/jgheHhj/waxinosutokaxi.pdf
    • https://cdn.sqhk.co/zumumolebajo/j34dLmu/muxomimugeso.pdf
    • https://cdn.sqhk.co/pemenixa/jbgeepY/65084076495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://defafezo.epizy.com/44413839115.pdf
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_16a3f2ee7a95497d8d075e4ffb8e19ca.pdf?index=true
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_6e15f078096e484fb50f30ba5906fedb.pdf?index=true
    • http://xijotat.rf.gd/mogusarafada.pdf
    • http://damokoz.epizy.com/connected_components_workbench_software.pdf
    • http://gebilame.epizy.com/10539439329.pdf
    • http://komivarutu.epizy.com/resumen_de_romeo_y_julieta.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_0050456437844432b594a02810d45fb9.pdf?index=true
    • http://kudogal.rf.gd/17157360354.pdf
    • http://fabonek.rf.gd/bozibugedud.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_541123f47f7a47048b29b00200e56f88.pdf?index=true
    • 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_off0000cdc4.bin
86f2f50ae325bbe91e9bc5d3619ebff7312cbda89c12d88f2a5c058343d5063b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 5436 bytes
font_01_sfnt_off0000e024.bin
e841d941d793c73887964884ba1558e81bd0495b371b6e3a60d03c98c559019b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 10328 bytes

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