Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bea49e31e01f0c…

MALICIOUS

PDF

93.1 KB Created: 2021-03-15 13:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5b776987c1c1db2186bf61dd621e82 SHA-1: 2537b171c33143cdc045de83b7e0c01febd9128a SHA-256: c4bea49e31e01f0cea6abb5077b84d287e3b194d284e0925880dec76ba94bd53
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains numerous external links, with one pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a legal case, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/wix?keyword=state+of+georgia+vs+denver+fenton+allen+update
    • https://cdn.sqhk.co/refuvowur/9Mggf62/lekunanibuzuninabonusu.pdf
    • https://cdn.sqhk.co/fiseguvugele/jaOxugj/brawl_stars_twitter_poll.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c7a93c9-cef0-4e1c-9dc2-91c97a2f7823/spectrum_tv_remote_control_instructions.pdf
    • https://uploads.strikinglycdn.com/files/260a289b-1d0d-487e-be04-f4ff08996462/sizabikolivuzoden.pdf
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_c07f43a95e3d4aa58a101f0128a09d79.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a086623d-5089-4fc4-b750-d7d0bd71005e/can_i_use_regular_all_purpose_flour_in_my_bread_machine.pdf
    • https://uploads.strikinglycdn.com/files/2e2024af-d3e8-4630-a6fb-93da99778d35/24644621582.pdf
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_0200d7e169984495b23852e27cfc8c55.pdf?index=true
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_d7d1e0f1591c4a62a1e4ead7391c48c5.pdf?index=true
    • https://s3.amazonaws.com/tujeviwakirawu/53440172964.pdf
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_ee0a35b62a2847d5a4253fc1019d44b8.pdf?index=true
    • https://s3.amazonaws.com/pugomonapoxuxe/butabifareb.pdf
    • https://uploads.strikinglycdn.com/files/a2e4f0ab-7d81-460e-bc28-f071f5f0abf8/caractersticas_del_sistema_poltico_mexicano_de_1939_a_1982.pdf
    • https://uploads.strikinglycdn.com/files/15e45f80-3861-4c5a-8db8-28428ca92b32/39014891033.pdf
    • https://uploads.strikinglycdn.com/files/b23aa81e-8fda-4fc6-9913-02de47744538/36_stratagems.pdf
    • https://uploads.strikinglycdn.com/files/0f71557b-1309-4e32-8420-784e4fabe64d/36179581143.pdf
    • https://s3.amazonaws.com/legipalofi/homeostasis_reading_worksheet_middle_school.pdf
    • https://uploads.strikinglycdn.com/files/2e3f9304-6cb1-4635-b894-663342f0c9c1/46852660004.pdf
    • https://uploads.strikinglycdn.com/files/df793033-1bb2-4ba1-927c-74525e97ae2e/writers_choice_grammar_practice_workbook_grade_8_unit_10_answers.pdf
    • https://uploads.strikinglycdn.com/files/c3bd5395-3b0c-4fbb-b84f-be84abce3828/romeo_and_juliet_notes_for_students.pdf
    • https://s3.amazonaws.com/daraniwekamidir/petex.pdf
    • https://uploads.strikinglycdn.com/files/d6bf0f72-b1cc-4cf8-899e-21e8f564cbb9/50266481818.pdf
    • https://uploads.strikinglycdn.com/files/ad01b576-34e3-4f9f-80c9-ac1786730e08/how_to_connect_vizio_sound_bar_to_tv_remote.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_901c28de75144dddb2fd74d50789fbe2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010197.bin
2752993a775614d221a661c058dad987b47b14656ed8364272baa1779dd85c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 13268 bytes
font_01_sfnt_off00012c68.bin
e2c4660e6eb6e8fcde8d59079f25884ecafcb41fa2c802c022b5baa9f1fc7a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 5372 bytes
font_02_sfnt_off00013ec8.bin
15e39c7876800ae70c7335140b323cff21c57694738d5b98c05dfdfca92497ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC8 10788 bytes

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