Malicious PDF — malware analysis report

Static analysis result for SHA-256 958bbe441519fd9d…

MALICIOUS

PDF

81.1 KB Created: 2021-02-24 11:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 432a58b04e84ac08828e9e944d85c0fe SHA-1: b19e8b52cfa2b0734d54917b06a3a4d237d18ef4 SHA-256: 958bbe441519fd9d3a021cf1b0e273a7293c16ea45753c6f97b9da29fd212009
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. One prominent URL, 'https://seumenha.ru/wix?keyword=man+at+arms+he+man+sword', appears to be a lure, while another, 'http://rufuregebedus.rf.gd/gevumelikewupupapututeveb.pdf', is part of a suspected link farm. The PDF's structure and the presence of embedded URIs strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=man+at+arms+he+man+sword PDF link annotation
    • http://eurofamily.pro/bipepevasizesibazekm2.pdfIn PDF document text
    • https://gavititexufo.weebly.com/uploads/1/3/3/9/133997787/2aa5aac.pdfIn PDF document text
    • https://kutijodokijo.weebly.com/uploads/1/3/4/7/134706590/nomoloseronibexu.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/Q1bjchd/thrifty_car_rental_reviews_lax.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/zijujunomap.pdfIn PDF document text
    • http://rafale.store/arby_nutrition_calculatorcphff.pdfIn PDF document text
    • http://epaytds.xyz/2645581352t6swh.pdfIn PDF document text
    • http://repair-telefonov.ru/kerunevemufueqmzk.pdfIn PDF document text
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/sibexexagibofoxugut.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/iPfiigj/tony_hawk_s_skate_jam_apk.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/9295004.pdfIn PDF document text
    • http://susarivusu.22web.org/computer_stuff_word_search_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufuregebedus.rf.gd/gevumelikewupupapututeveb.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/reverse_phase_high_performance_liquid_chromatography.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/kumovarat.pdfIn PDF document text
    • http://pikarofuwab.epizy.com/safaxajo.pdfIn PDF document text
    • http://raxajuneneg.epizy.com/axiom_verge_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/67934914324.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/pezimoronefojesobelineguz.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/64124517412.pdfIn PDF document text
    • http://mivowejow.rf.gd/27654797541.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/73153805464.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_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 5128 bytes
SHA-256: b70c1ab36ea0190345a2d0a061aa12ebce6658c6b43db76d27d740946999452f
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10232 bytes
SHA-256: 8bd37f42a811f13988f09229dce600b1a8a383975d885cbbe2606d4914d64e3e

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