Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dac48f13ac9892…

MALICIOUS

PDF

104.9 KB Created: 2021-03-25 01:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3661ea5a61f52b654103b348a4602778 SHA-1: 9108a53d158fef0ad93cf9ff939be5b08ea9b3d5 SHA-256: c5dac48f13ac9892fd17144fdb9e20c38b6e4034889f2c83d7378d2b78b71697
66 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, which is a common tactic for SEO poisoning and phishing. The ML classifier strongly indicated maliciousness. Although no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/award?keyword=generalized+anxiety+disorder+treatment+pdf PDF link annotation
    • http://babudategajuzul.iblogger.org/treaty_of_guadalupe_hidalgo_apush_chapter_17.pdfIn PDF document text
    • http://kuninikulu.iblogger.org/jidokupatinikitamixu.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/transfer_of_training_in_sports_bondarchuk.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/sharp_objects_episode_5_credits_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://daxokefi.epizy.com/96496815672.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_2e2d75e1763448819e8561c05a6acf7c.pdf?index=trueIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_486cafec10d649d0ac1d8b1953d3693a.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_a045a3a17fef49a990d516112511cd72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48239832-4eff-402b-b2d6-50410cba4480/rikegamolepugiwixegevexep.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/30669906759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999d0883-cc04-42e9-b7d6-6861d8393fa4/magic_chef_wine_cooler_repair_manual.pdfIn PDF document text
    • http://moxedudorilo.rf.gd/find_command_in_linux_with_examples.pdfIn PDF document text
    • http://kefegaruxofum.rf.gd/66864010039.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/idle_empires_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ae3a57-02cc-4c2c-ab71-707dbee47eda/xbox_1_controller_charger_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e2e7804-2347-4661-9dc8-71fc3f02202b/how_do_i_use_mophie_juice_pack.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_068214338d7148edb85bf517d426de3a.pdf?index=trueIn PDF document text
    • http://novoboninixeme.epizy.com/xozebikoralanimebemomok.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/cardiovascular_physiology_concepts_2nd_edition.pdfIn PDF document text
    • http://jebebubijegew.rf.gd/gobevelakibedenazasene.pdfIn PDF document text
    • http://gitodake.myartsonline.com/ctet_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f3ee81-92e1-45d3-9aa0-d2151f468b73/watchman_nee_biografia.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_off000150ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AE 5224 bytes
SHA-256: b96e2939cfa135402e0ff2ff5e8e3d5bb80789d28e384768b41845789c37b017
font_01_sfnt_off00016270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16270 11216 bytes
SHA-256: 32d3559b48ec989b6df42df2349dfb445538501c136dcba653f96042d3dd5a46
font_02_sfnt_off0001881f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1881F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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