Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6090cef52817ca…

MALICIOUS

PDF

68.4 KB Created: 2021-05-17 20:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584d6fe7f690c9305262acefa1d98925 SHA-1: 936487aca741cf2c33e70e315dfa488266ce778f SHA-256: fc6090cef52817ca4658dec840af790404006c3a96afa09751f869be2aa27210
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The primary external URI observed is 'https://jumiwimov.ru/strik?utm_term=2012+dodge+avenger+sxt+battery+size', suggesting a phishing or content-luring attempt. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to redirect the user to malicious content.

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-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=2012+dodge+avenger+sxt+battery+size
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/3616811.pdf
    • https://static.s123-cdn-static.com/uploads/4388626/normal_5ffd4ffd81c39.pdf
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5fcd182d2f3b1.pdf
    • https://cdn-cms.f-static.net/uploads/4445736/normal_5fd3b7a58810e.pdf
    • https://cdn-cms.f-static.net/uploads/4476783/normal_6068801b1bf8b.pdf
    • https://cdn-cms.f-static.net/uploads/4481839/normal_6028810da44f1.pdf
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/8001858.pdf
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5ff8c4ac868e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sulasatevirexo/reformed_theological_seminary_free_online_classes.pdf
    • https://s3.amazonaws.com/boduxatavepe/juggernaut_method_2._0_spreadsheet.pdf
    • https://s3.amazonaws.com/bisiku/iso_31010_download.pdf
    • https://s3.amazonaws.com/sagotomagin/ford_mustang_mach_1_weight.pdf
    • https://s3.amazonaws.com/dowavelaxam/define_literature_in_your_own_words_brainly.pdf
    • https://s3.amazonaws.com/remufuzu/fikamujupururi.pdf
    • https://s3.amazonaws.com/sabegokek/54223499746.pdf
    • https://s3.amazonaws.com/bajuse/92077813416.pdf
    • https://s3.amazonaws.com/boduxatavepe/dc_series_motor_questions_and_answers.pdf
    • https://s3.amazonaws.com/fujadabez/84968428657.pdf
    • https://s3.amazonaws.com/putelekireza/el_arte_de_amar_erich_fromm_libro_completo_descargar.pdf
    • https://s3.amazonaws.com/popisiburewixuj/easterly_government_properties_annual_report.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_off0000cd5a.bin
969d304143d61a7019fc89e1f4ac40595dbb6f23d43d2cad126206354f35adba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 5612 bytes
font_01_sfnt_off0000e09c.bin
736f309efbcba0aa0b1b21a68199f9b9d1ead874df5cd095ea7309d19a382536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 10444 bytes

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