Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cdcee00bf02ccb…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 08:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afbe167e82a22b48b9b6bbd3e4c48d23 SHA-1: 4fde15b08a486f31f2fbde750666f350db05a78b SHA-256: d2cdcee00bf02ccbcecb4e30aa7467d56d3ced858eca3ec4a83ac1939f9aac89
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting it is part of a link farm designed to distribute malware or phish for credentials. The primary malicious URL identified is https://jumiwimov.ru/strik, which is presented as a search result for 'Skyrim special edition how to install mods vortex' to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=skyrim+special+edition+how+to+install+mods+vortex
    • https://cdn-cms.f-static.net/uploads/4418391/normal_600a57d579be6.pdf
    • https://cdn-cms.f-static.net/uploads/4444371/normal_5fdabc7df2dab.pdf
    • http://jotafitosixa.getenjoyment.net/74399108792.pdf
    • https://static.s123-cdn-static.com/uploads/4479435/normal_60038eb70764c.pdf
    • https://cdn-cms.f-static.net/uploads/4450151/normal_603d75dc0d38f.pdf
    • http://pimesizawox.sportsontheweb.net/limorutomogixorodop.pdf
    • https://static.s123-cdn-static.com/uploads/4495838/normal_5fcfec89175df.pdf
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5ff452f1d1740.pdf
    • https://cdn-cms.f-static.net/uploads/4420240/normal_600b371687977.pdf
    • https://cdn-cms.f-static.net/uploads/4389606/normal_604d0c079dc2d.pdf
    • https://cdn-cms.f-static.net/uploads/4475197/normal_603afc9da4b36.pdf
    • https://cdn-cms.f-static.net/uploads/4446636/normal_5fd77d1bd4cd8.pdf
    • https://cdn-cms.f-static.net/uploads/4371809/normal_602cfa90ce03a.pdf
    • https://cdn-cms.f-static.net/uploads/4443292/normal_603365a4940ad.pdf
    • https://static.s123-cdn-static.com/uploads/4470981/normal_5febb13c22d31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dejiwupije.epizy.com/formal_letter_for_leave_application_in_college.pdf
    • http://rivenoke.onlinewebshop.net/zuwenaburesumam.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_f4733f94922847869cb4216718701a4d.pdf?index=true
    • http://tupazovux.epizy.com/numenera_bestiary_2.pdf
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_0cadb74a16484fefbabfe8c1735952ee.pdf?index=true
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_470522871b1c4e49a3d238946e558e33.pdf?index=true
    • http://xugojejusovofeb.rf.gd/asp_net_mvc_example_with_database.pdf
    • http://jofewasax.rf.gd/aristoteles_moral_a_nicomaco.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_03d78226121e483d88270d30457d33ac.pdf?index=true
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_a755d8de20724c8988fc548b703fc0d0.pdf?index=true
    • http://kuvepagigifu.rf.gd/simple_math_iq_test_with_answers.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_off0000f722.bin
4315865d919bdbc31c5dd7cda54d6551093f1da5f91989d256ea0856eaa020cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5804 bytes
font_01_sfnt_off00010ad6.bin
2966f0486b491eda396ab1201ef5dd2e08c72009f3a3328711e2e902895f9824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 11092 bytes

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