Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dd48425806a96f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-19 18:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ac8ffbdcd235ea6b684d2005e33e88e SHA-1: d7cbd0c044ab8cc5c6665ba333d1d6c7d6a9bd6b SHA-256: c6dd48425806a96f268e78adc55157383e23d72fe89d8d6302de4e29563f806e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO spam or to redirect users to malicious sites. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, with the primary observed URL being https://botokaw.ru/strik. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=da+vinci+codex+atlanticus+pdf
    • http://fakts.design/873699060684w5ih.pdf
    • https://cdn.sqhk.co/dutaxato/VjaEhcT/disorder_synonyms_and_antonyms_dictionary.pdf
    • https://xusozetogiza.weebly.com/uploads/1/3/4/6/134620001/75bc09cff624573.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6011f1cce2f30.pdf
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/2808d12e762.pdf
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/5957007.pdf
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/1553804.pdf
    • http://topstop.site/xuritajutixulujipazukusana8l7a.pdf
    • https://cdn.sqhk.co/xuxawexa/jjK5Bhh/moto_racing_mod_apk.pdf
    • https://cdn.sqhk.co/sileluzorupo/dhahc8A/female_mannequin_dress_form_torso_dressmaker_stand_display.pdf
    • https://static.s123-cdn-static.com/uploads/4409246/normal_5ffc025d0f25b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fafb03c9-8903-4368-87d4-e37faafb7707/kovabaratosedegipi.pdf
    • https://uploads.strikinglycdn.com/files/965bac1a-4619-436c-a2ad-7e9d0842c4f9/kegadabagutawokegijipu.pdf
    • https://uploads.strikinglycdn.com/files/46d2f994-d7fe-49a7-ae27-80694bad31f6/is_the_acer_chromebook_14_good_for_gaming.pdf
    • https://uploads.strikinglycdn.com/files/40db7a2d-3c53-4500-8098-89cc120ed46e/tojarovupivujajevax.pdf
    • https://uploads.strikinglycdn.com/files/beb7d01d-2b27-4831-bbcc-4ba69f59a79c/how_to_set_up_interval_training_on_map_my_run.pdf
    • https://uploads.strikinglycdn.com/files/151fcea7-254b-44ea-8be3-be2786e0caed/is_cyberpunk_worth_it_on_series_x.pdf
    • https://uploads.strikinglycdn.com/files/3184b846-da33-4672-9fbe-b78a1fd69370/human_computer_interaction_job_prospects.pdf
    • https://uploads.strikinglycdn.com/files/9c369ae9-5c6b-4ef2-b4e3-21d175bcba5b/persona_4_golden_nanako_social_link_guide.pdf
    • https://uploads.strikinglycdn.com/files/a01b6183-392e-4898-b630-41c7095e6163/wafem.pdf
    • https://uploads.strikinglycdn.com/files/60cbe57b-37b4-42f6-9e8f-d43a87841467/why_wont_my_spectrum_remote_change_channels.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_off0000f9e1.bin
4d8069ea4eaa47624c27207b5fb4c7985802c6a6ea584903a13fe3661519e9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 5180 bytes
font_01_sfnt_off00010baa.bin
e071dc71a54a8d257792a70c87530adfc8b0716fd968b5da622a2019747c9468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10860 bytes

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