Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e6f75eaeab667d…

MALICIOUS

PDF

81.0 KB Created: 2021-03-17 20:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00640087197dfd4820afb45fc63bff33 SHA-1: e410e519b02da909b62e6f2bb680e53b0ac3db9c SHA-256: c7e6f75eaeab667db870f0abef72cd6a5738552be4c86af33ec85cd19f03d6bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm designed to direct users to other PDF documents. One prominent URL, 'https://nipisod.ru/123?utm_term=billing+address+information+en+espa%25C3%25B1ol', is embedded within the document's text, suggesting a phishing lure related to billing information. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=billing+address+information+en+espa%25C3%25B1ol
    • https://cdn.sqhk.co/zivuputid/NThjgfJ/draw_climber_free_arcade_run_games.pdf
    • https://cdn.sqhk.co/jeporikate/hWghnVK/preschool_learning_apps_for_ipad.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6049d5286cd91.pdf
    • https://cdn-cms.f-static.net/uploads/4450721/normal_5fe95ca949a11.pdf
    • http://zinedoxo.22web.org/when_do_i_regenerate_my_water_softener.pdf
    • https://cdn.sqhk.co/sarodeduz/5KRic4e/75933630955.pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fd9d6ef4457a.pdf
    • https://cdn.sqhk.co/javufikari/Z4KljcF/piano_tiles_anime_music_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4383170/normal_60287175c7d9c.pdf
    • http://gakivako.iblogger.org/94006453210.pdf
    • https://cdn-cms.f-static.net/uploads/4486054/normal_601ee9d8c9e82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jufonab.epizy.com/87441662532.pdf
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_9cce16b810a6401f956c8c124826eacd.pdf?index=true
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_5ac3004c98c14cba996c9ccd01f47065.pdf?index=true
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_9c1bae3482e149c19ec96ad1228466f6.pdf?index=true
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_6b04a74cf5904badab608d9a001cd2bb.pdf?index=true
    • http://romutipi.rf.gd/saudi_arbitration_law.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_ba5e0ac230944673bff0f53e87414223.pdf?index=true
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_d8b7dee8761a4d5a9f501960cf2c0cf3.pdf?index=true
    • http://keguwaburafokul.epizy.com/tewivakasogumidekimegaxa.pdf
    • http://rudurugineme.epizy.com/what_are_the_tools_used_in_qualitative_research.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_5e28667059914804b134444a85af58b1.pdf?index=true
    • 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_off0000f9c6.bin
d0fc20e37f00b44e307ee4beab6e91008520a79e58cb4d27b7320ca9786837de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 5624 bytes
font_01_sfnt_off00010c9b.bin
eb53e1a4bc9eae51ec2fd79c905801e5879dd6cf01e6c73c3615201cffb6ab5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 12240 bytes

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