Malicious PDF — malware analysis report

Static analysis result for SHA-256 6128044bb4af9b1b…

MALICIOUS

PDF

78.9 KB Created: 2021-06-08 10:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9661ed6cb5b3c7f0ef7c07f24d12befc SHA-1: ce6ab458c176530d50587c562bdda7211f434ebc SHA-256: 6128044bb4af9b1b30b911d8bbd8b018e44e77a5b8b5ef0b6b086f985578f517
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one pointing to 'maypoin.ru', suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of external links and the phishing detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=audubon+birds+and+climate+change+report
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/87a5dcd646bdf59.pdf
    • https://cdn-cms.f-static.net/uploads/4459777/normal_601b7123618f0.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fd3573534c19.pdf
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/petarabut-xodaxexej-mobimo-vukasog.pdf
    • https://tazimomudaz.weebly.com/uploads/1/3/5/9/135960162/joduwiwuvejufugeke.pdf
    • https://cdn-cms.f-static.net/uploads/4452193/normal_6021f9f32e9c6.pdf
    • https://xusumenebob.weebly.com/uploads/1/3/4/4/134478057/2403387.pdf
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5feb7193e7ec1.pdf
    • https://merusomewazotom.weebly.com/uploads/1/3/4/5/134514041/d79150a6002.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4b61982-1a22-4fac-b31b-92d66dd5e216/xerikadexutazup.pdf
    • https://uploads.strikinglycdn.com/files/2e25e31f-4a1c-4e98-b8df-ab923f0237cf/afk_arena_codes_2020_august.pdf
    • https://uploads.strikinglycdn.com/files/6afaa824-cc5f-4039-a6b4-39194666449f/44301354642.pdf
    • https://uploads.strikinglycdn.com/files/f6314866-717d-46b6-960f-dc2ce5e31a97/ruger_p95_9mm_accessories.pdf
    • https://uploads.strikinglycdn.com/files/d7787738-8039-463e-bc7b-377e54cea462/97.1_the_river_radio_station_phone_number.pdf
    • https://uploads.strikinglycdn.com/files/05e6ff1b-672c-413a-89af-904618b4a7b3/why_the_book_of_jasher_is_not_in_the_bible.pdf
    • http://zuwofig.pbworks.com/f/hack_para_among_us_mod_menu_apk_download.pdf
    • http://zekodunu.pbworks.com/f/xuwibolosakax.pdf
    • https://uploads.strikinglycdn.com/files/96ee9ed3-b775-43d6-8303-e6413fdbcc7e/76398451195.pdf
    • https://uploads.strikinglycdn.com/files/d485c2cc-6366-4ad4-8d3f-8c5110dbd59d/what_is_the_structured_interview.pdf
    • https://uploads.strikinglycdn.com/files/a55ab471-bb6a-4d99-ba0a-34ea7a559926/resuxivol.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_off0000f18e.bin
758fba012df3c79d957a3b118c24f68b813049db407d3735c0af9e6957073654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 5616 bytes
font_01_sfnt_off00010471.bin
11185c51f336d22b78a6ec3f5e3ac4a03e311fe424d0efefc00a8f7fedbbb683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 12888 bytes

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