Malicious PDF — malware analysis report

Static analysis result for SHA-256 1833c4637e322ff8…

MALICIOUS

PDF

95.3 KB Created: 2021-05-21 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40d822937d61858ec41fd0f2cc3f1860 SHA-1: 8c8fb1aa80eac7218cfeb31a31b65c3e7e39d635 SHA-256: 1833c4637e322ff806bd67b585cf7e8802d8b70a295a7ce9887c77939ed14ebb
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO spamming tactic. One of the primary links directs to a suspicious domain, likely intended to host malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=glitch+argent+gta+5+online+ps4+1.50
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/xafopogivebimi.pdf
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/gapisaxotatov-jagopuli-posedexo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b9d0ebd-9850-483f-b611-a86c44e078b7/21548203412.pdf
    • https://uploads.strikinglycdn.com/files/df45615e-300f-4805-8a73-408a25414371/phet_lab_states_of_matter_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/98b7320f-301b-4d7a-93c4-3fdfdf0469fb/formula_acido_clorhidrico_con_hidroxido_de_sodio.pdf
    • https://s3.amazonaws.com/mosezavor/is_it_possible_to_cross_rate_in_the_navy.pdf
    • https://uploads.strikinglycdn.com/files/39df21e0-1106-422c-b8a3-af2bc797b634/18944905228.pdf
    • https://uploads.strikinglycdn.com/files/69ca8474-9f2f-42a1-af4e-f1e023377228/purerizafeda.pdf
    • https://uploads.strikinglycdn.com/files/0b0267a4-5446-4188-b0a9-6eb862f3b27d/philips_norelco_series_7000.pdf
    • https://uploads.strikinglycdn.com/files/e89c3ab5-f73f-423d-ac04-8a6253d1bab5/sewopuzugovugivilupesini.pdf
    • https://uploads.strikinglycdn.com/files/e34722c5-49b0-4e60-b1cd-d63698e9cfac/duviberatibigazuzo.pdf
    • https://s3.amazonaws.com/jezobasit/besefixo.pdf
    • https://uploads.strikinglycdn.com/files/a8128dc3-3c4e-46b7-aee6-a70171b6a485/vc_andrews_heaven_casteel_series.pdf
    • https://uploads.strikinglycdn.com/files/a614cbe4-702c-4309-9c6d-514371d6e492/2003_ford_6.0_diesel_bulletproof_kit.pdf
    • https://uploads.strikinglycdn.com/files/05553d81-a064-4cfd-b711-f828325adaff/62708308788.pdf
    • https://uploads.strikinglycdn.com/files/c5bcef1b-af4d-4724-9b5e-4f4ed197532b/gendered_technology_examples.pdf
    • https://uploads.strikinglycdn.com/files/e00e7a9d-2331-45c1-a46a-e61f526ebc50/meade_telescope_setup.pdf
    • https://uploads.strikinglycdn.com/files/56992e23-3b52-422c-bf2f-4b95d6db392c/la_gallina_degollada_resumen.pdf
    • https://uploads.strikinglycdn.com/files/f64497d2-3795-4c3f-9cc0-221b3869f5e7/the_art_of_racing_in_the_rain_quotes_and_page_numbers.pdf
    • https://uploads.strikinglycdn.com/files/1897822f-d454-4f66-bb6f-3b2f74932acd/be_thou_my_vision_citizens_chords.pdf
    • https://s3.amazonaws.com/daraniwekamidir/sqlite_old_version.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc7.bin
61495066730844884101a1c9d60d6813f9216f0fec9243873a60dee7c1e760dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 5664 bytes
font_01_sfnt_off00012312.bin
ce64b96e35365f7ca942be059691a2a4ea0f06da43258ac66389e3c25899b864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 1796 bytes
font_02_sfnt_off00012be4.bin
632d5bce11dfcf78e77a3eaba0b486bc6f3ee084e4daf228fa1423acec3c7234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE4 13820 bytes
font_03_sfnt_off0001590c.bin
7944677f39aefd0e079b6306faec719f5a609f1c431ca89bf293e02ca10dab23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1590C 16296 bytes

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