Malicious PDF — malware analysis report

Static analysis result for SHA-256 376430735900d862…

MALICIOUS

PDF

78.1 KB Created: 2021-06-01 13:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9406b2c2f26d219af8e7ee890c4cccbb SHA-1: 35cc88cf2e71ac8e4f7c7c17d8436863c21b04fe SHA-256: 376430735900d8624998c86b060f4e1692f81a93c04bf61199d048b1ff13352a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://drafthe.ru/pbw?utm_term=how+to+become+a+spanish+medical+interpreter', suggests a lure related to professional interpretation services. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards an attempt to redirect users to potentially harmful content or phishing sites.

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://drafthe.ru/pbw?utm_term=how+to+become+a+spanish+medical+interpreter
    • https://nejituxunexako.weebly.com/uploads/1/3/2/7/132712325/5785616.pdf
    • https://cdn-cms.f-static.net/uploads/4402933/normal_604a44b02bb82.pdf
    • https://wukodotimage.weebly.com/uploads/1/3/4/4/134487216/dunew_wulix.pdf
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601a5d8e43eff.pdf
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/mukuvidomaref-rarifa.pdf
    • https://static.s123-cdn-static.com/uploads/4368242/normal_6002d09d6d2a1.pdf
    • https://jedudelovaki.weebly.com/uploads/1/3/4/7/134731231/3843637.pdf
    • https://cdn-cms.f-static.net/uploads/4413223/normal_602e84eed44ac.pdf
    • https://cdn-cms.f-static.net/uploads/4383572/normal_6049db2266be5.pdf
    • https://cdn-cms.f-static.net/uploads/4449012/normal_6036820da2477.pdf
    • https://cdn-cms.f-static.net/uploads/4408718/normal_606d1b714b08e.pdf
    • https://cdn-cms.f-static.net/uploads/4475866/normal_600d65392a08c.pdf
    • https://novuwujuvum.weebly.com/uploads/1/3/0/7/130776589/66c8e2.pdf
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/xakosade-pizalot.pdf
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/1378958f8ea173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kolelulu.pbworks.com/f/arunachalam_tamil_movie_download_tamilyogi.pdf
    • http://fodorafirig.pbworks.com/f/fugagef.pdf
    • https://uploads.strikinglycdn.com/files/1029544d-0989-46fc-8935-c9cc1c1f8bfb/later.pdf
    • https://uploads.strikinglycdn.com/files/930d823d-e00c-49c2-85be-56c7bd912d27/lean_canvas_template_powerpoint.pdf
    • https://uploads.strikinglycdn.com/files/fb269360-6449-46e8-962e-05a6168bb830/resumen_del_futbol_a_sol_y_sombra.pdf
    • http://fulusivijomu.pbworks.com/w/file/fetch/144451434/10104884749.pdf
    • https://uploads.strikinglycdn.com/files/a507f1fa-66cc-4c3c-ae8c-9ba645accc6d/do_androids_dream_of_electric_sheep_important_quotes.pdf
    • http://jajisaparev.pbworks.com/f/nadetofojomotikotebupagik.pdf
    • https://uploads.strikinglycdn.com/files/40e5b33e-a653-4052-a76b-0b0eca36ac6b/gejon.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_off0000f244.bin
f0a815cf161b01570b9d1939d407df196181887029c6765b0c92179b200af8e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 5504 bytes
font_01_sfnt_off000104d8.bin
536faff842aad84229012b7424d783d6db9b145a573dbf1fde851f2f5cfa2583
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 11208 bytes