Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e74341887dc4f4…

MALICIOUS

PDF

82.2 KB Created: 2021-02-25 06:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 87029594c761e8f51eb7230459613024 SHA-1: c64572c08df7655137d0918b7da2abeda8a8c86c SHA-256: 86e74341887dc4f465aeb90e2ef41319a21e964b4c763d1fe615f36aac65fa37
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+is+the+best+knife+sharpener+for+the+kitchen In PDF document text
    • https://cdn.sqhk.co/zuvutose/P7zdbjf/76904176644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_6006ffb8a32e6.pdfIn PDF document text
    • http://workbykoder.xyz/hp_tet_non_medical_question_paper_20190phwk.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ngciSge/meetme_chat_app_for_pc.pdfIn PDF document text
    • http://qunit.space/zifisotoxidolelomg1os.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_6032b022e9b6e.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/DjehgCi/heart_mobile_cover.pdfIn PDF document text
    • http://temppicture.xyz/options_futures_and_other_derivatives_solutions_manualac5b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5fd1bc4861805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fe9d7169b7e9.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Yfijy3K/rc_battle_tanks_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_600b57dec1c46.pdfIn PDF document text
    • http://sudakomazagupa.22web.org/84437430652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470211/normal_5ffb65e85bb6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_603665f6006b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_601d97715173f.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/mujesogi/jotifirijelebaxeruni.pdfIn PDF document text
    • http://fufopabi.rf.gd/79645936654.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/xunuzezogelezafiwefedev.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/medavie_blue_cross_insurance_forms.pdfIn PDF document text
    • http://mevediruzorapaz.rf.gd/html_text_link.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/gafalijosenodaxivifilogo.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_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 5288 bytes
SHA-256: ed1a8d1c3d7c0dd34919009b967038b4ceac469e85532da9f297d0560935c2b2
font_01_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 10548 bytes
SHA-256: e04aa7c5d05386b74012a162df3a8132e73a007ab8bea2642487b33125db26d9

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