Malicious PDF — malware analysis report

Static analysis result for SHA-256 494fba442be28eec…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 14:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c42f27d9c25207d67b65bd569df06efa SHA-1: 1d2d5ec5b4fbf51e04d8839af74c569649fc128d SHA-256: 494fba442be28eec529563b1fbd41f359cfead0c8961574d620eb88f80382a7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or spamming operation. The primary malicious URL identified is jumiwimov.ru, which is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=distress+tolerance+scale+pdf
    • https://cdn.sqhk.co/vopufepivipe/juggrl5/70937835902.pdf
    • https://cdn.sqhk.co/nisugewameru/geMb97Y/36180161901.pdf
    • https://cdn.sqhk.co/dagufiwus/jckmjcp/matefolarewiv.pdf
    • https://cdn.sqhk.co/jutusaxibu/jhMifhh/celebrity_voice_changer_app_price.pdf
    • https://cdn.sqhk.co/liripudeb/gidQ3ic/random_my_little_pony_name_generator.pdf
    • https://cdn.sqhk.co/wujejelot/aLpif2n/tiere_stricken_kostenlose_anleitung.pdf
    • https://cdn.sqhk.co/rorezina/vb3ZBia/bloons_super_monkey_2_infinite_black_ops_apk.pdf
    • https://cdn.sqhk.co/juxefirapuf/PDtieAv/vugegovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41d7a7b8-9667-42fc-ae17-775457f8668d/mcgraw_hill_wonders_1st_grade_sight_words.pdf
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_ec54463c355f4ae183bb4e0dfbaf732d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d9043bcc-c1c0-49dc-8dba-ddf269c7a307/78805798783.pdf
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_48b24085335f43ae9ece4e5c89a8b764.pdf?index=true
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_85f65dbdaf134dd791fcb158591d4464.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_1a00d80a4fd84d3ebde05ccc86ec2de0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d10ab67f-24a3-4ecb-9d63-73576d613102/essay_writing_for_middle_schoolers.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_40f7f278ef5a49a88fbaa15390fd5a5f.pdf?index=true
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_729ddcf1dcbf44e88d040c277dc24093.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_522d304bd94c4b02b894784be6ed7832.pdf?index=true
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_8607f7b7b2e94edebda77d4c7a739836.pdf?index=true
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_524a2fb606ea4f93ba2d23d545d3a6e7.pdf?index=true
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_83ea4cfa693647eb95e2805133dee3ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e4f2681-b09f-42fa-b282-dcd7c5bf323e/wijolijuzowog.pdf
    • https://uploads.strikinglycdn.com/files/18a5a278-0679-4595-868a-fc5c22d9c6fe/what_are_the_five_intermolecular_forces.pdf
    • https://uploads.strikinglycdn.com/files/c5b1af38-1eb2-4340-a682-074e5ccdaea1/essay_examples_for_high_school_students.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_off0000f5aa.bin
776c8df19dc0b78677fc24316c9dc8488f0f3b22e6f8e1f6f42050217c34d429		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5148 bytes
font_01_sfnt_off00010742.bin
dad237f75a61dac3a7c226553ce48504a1426bd6858cf28217dd020c6c093d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 10844 bytes

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