Malicious PDF — malware analysis report

Static analysis result for SHA-256 768b3a41077d086c…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 21:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2ff7581b5fccb2e7e064e43e73c22c98 SHA-1: 8b13fab6ae9a4d3269d645924e9e45ec6e6317b2 SHA-256: 768b3a41077d086ce5fbe59a0c1d569a1c15e9fb009e97ea7b35df953d6bcbfc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain 'vilenefex.ru' and another to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Cyberpunk 2020 play online' which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/123?utm_term=cyberpunk+2020+play+online PDF link annotation
    • http://furafofuvobomu.22web.org/burger_king_coupon_mai_2019.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/7315440.pdfIn PDF document text
    • http://xugejujivekivu.iblogger.org/megoduviwamezev.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/13960329fd6c70.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/percy_jackson_graphic_novel.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/39003780715.pdfIn PDF document text
    • http://busuvogonateja.22web.org/apache_http_server._exe_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozizowumideni.rf.gd/denepemofajipexu.pdfIn PDF document text
    • http://sowabufiki.rf.gd/nelewazikolarewilupizo.pdfIn PDF document text
    • http://pakafadudu.epizy.com/juxijififa.pdfIn PDF document text
    • http://sofidubanelen.epizy.com/18525983000.pdfIn PDF document text
    • http://pivirujifija.epizy.com/humminbird_helix_5_g2_si_gps_fish_finder.pdfIn PDF document text
    • http://kafopazam.epizy.com/solubility_curve_worksheet_2_answer_key.pdfIn PDF document text
    • http://begosene.epizy.com/relusosotutazogonudeket.pdfIn PDF document text
    • http://mojedebebetum.epizy.com/yoga_anatomy_coloring_book.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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 5120 bytes
SHA-256: 932f03b53c031c79853a322377c36accfe55c2b52241d152267d4240ee785eef
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10700 bytes
SHA-256: e8edd16c348e4315af7da3c4cd9c4476f98b25b77977b15ba7924e63cef55ff2

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