Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdd7f622e56a954…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 20:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fd4325c3fd43b0122586d8b18e3ef614 SHA-1: 1fdcad834d065388b5c01d5e311c0bdf66e1f972 SHA-256: 4fdd7f622e56a9545daf249d1bf3c242a5320f98ffe274ebb72a4be90d784d99
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. It embeds multiple external URIs, with a primary suspicious URL pointing to 'seumenha.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/wix?keyword=gt+racing+apkpure PDF link annotation
    • https://cdn.sqhk.co/jegetito/jgmg8ji/wipudepal.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatapegil/hbYciag/mevufuduroxedekejuxolun.pdfIn PDF document text
    • http://kokoponabile.iblogger.org/how_to_work_out_interior_and_exterior_angles_of_a_polygon.pdfIn PDF document text
    • http://gaxelibagirisi.22web.org/schwinn_floor_bike_pump_with_gauge.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/ibe9Ogi/shadow_adventure_dx.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/lxxifjd/11610428435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupuxus/movies_hd_apk_for_ios.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_636c08c7ae424dad824dc14e00551344.pdf?index=trueIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_37e83325b756422cbcb71dd112eece56.pdf?index=trueIn PDF document text
    • http://penariziredalax.epizy.com/bacterial_genetics_by_snyder.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/drum_rudiments_sheet_music.pdfIn PDF document text
    • http://xezerubewuxa.epizy.com/real_mathematical_analysis_pugh_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/what_reading_level_is_the_series_of_unfortunate_events.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/strong_mother_quotes_from_daughter.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/emulsion_polymerization_theory_and_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/great_value_disinfecting_wipes_msds_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/how_old_was_romeo_in_the_1968_movie.pdfIn PDF document text
    • http://vanudedu.epizy.com/wanted_poster_template_in_french.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 4988 bytes
SHA-256: 6e60352a1a5ed340df00930e7e622010955c86e7be1186ed2b264f9f192baeb8
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10768 bytes
SHA-256: 8315e1876cf6ab36132aea24675241146a536dca465bedea83f730999fee52a6

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