Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf561f64855e756…

MALICIOUS

PDF

70.1 KB Created: 2021-04-07 02:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 86ccf7d300ac6940f2fe078577206261 SHA-1: 40b654b8ad7bf273b4fdd24e35f7c1625ae45506 SHA-256: 0cf561f64855e7569d9ce4414668d97bfc3b79f64a25ea1f8aebf736d9959584
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to redirect users to external sites, likely for further exploitation or malware delivery. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=why+did+miss+muffet+need+a+road+map+answer+key PDF link annotation
    • http://makamar.tech/wallpaper_tumblr_hd_flowers_loveozvfs.pdfIn PDF document text
    • http://labiosdewonda.com/cessna_310_parts_manualv18ni.pdfIn PDF document text
    • http://vashmaster.info/a_raisin_in_the_sun_differences_between_movie_2008_and_bookbl74o.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/hfgehaP/juloxa.pdfIn PDF document text
    • http://hookup668.site/71645495065djpnw.pdfIn PDF document text
    • http://laithub.pro/69859165343gzm32.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ggafafK/puzzle_bobble_2_neo_geo_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/xjjUYid/junovenoxapafuko.pdfIn PDF document text
    • http://hs-life.ru/reading_comprehension_test_grade_10zku8.pdfIn PDF document text
    • http://morj.space/569344228552pwd4.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/dighirB/pozekamavitufevuluse.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/gea8e4z/how_to_play_mini_games_on_minecraft_ipad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/understanding_by_design_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/tulaxebituvir.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/xutame.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/mini_football_pitch_dimensions_in_metres.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 3132 bytes
SHA-256: 610bcae8ba424332cf6a296e17d82e88b3766e548dbcc1818befba9bf986e6f2
font_01_sfnt_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 5520 bytes
SHA-256: d49d690723e5ca1ff3d7113b273b3bc6eb50dd26fd5bf4cef03eaf8a38f4962a
font_02_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10180 bytes
SHA-256: 6b10c58af9b0c3a143121e8d5fac5c8b73b9271eca27dbc3b706ab2544eb583c

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