Malicious PDF — malware analysis report

Static analysis result for SHA-256 785fcf473d94b7c9…

MALICIOUS

PDF

76.2 KB Created: 2021-04-16 19:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91c4e051c83e6da50778c8924de0e6c2 SHA-1: 42670d800608edfa0673d43d480963c69dcd2894 SHA-256: 785fcf473d94b7c9e4dc8fd0e52cce5bb6b35c351517b4621d6d7aaacd782064
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/strik?utm_term=how+to+fill+a+statutory+declaration+form PDF link annotation
    • http://wutanumijejol.sportsontheweb.net/xekuriwiwu.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/mcgraw_hill_grade_11_biology_textbook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446401/normal_5ff5db6b68bca.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/temperamento_sanguineo.pdfIn PDF document text
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/kamulimizumi.pdfIn PDF document text
    • http://fullpisetc.ru/what_is_the_book_of_the_courtier_about58bjp.pdfIn PDF document text
    • https://takibuvekinapix.weebly.com/uploads/1/3/4/4/134456834/83700241d501b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_601b351abb67b.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/vozazuza_turunazivagazo_kalerolu.pdfIn PDF document text
    • http://proba7.xyz/so_im_a_spider_so_what6vtfl.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/1387424925va3py.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376601/normal_5fdeec53f3bc6.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/savifin/government_extension_to_the_pmbok_guide_third_edition.pdfIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_e4a34ad789474ef3acbc49adc9114189.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_c01fbf900af644ed98b88ed8b987013f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/beginning_algebra_richard_n_aufmann.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/69163625618.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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 5324 bytes
SHA-256: 26765cc0cc0ebf1046840e3f0753d17074f8f87d3ccfb51129e49ecfd887a323
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 11000 bytes
SHA-256: c301e4a5f57c14776b55cd2a599a2ece6340221a67c2f29eb9f192a4ab248484

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