Malicious PDF — malware analysis report

Static analysis result for SHA-256 df613d7c69eeb86d…

MALICIOUS

PDF

79.3 KB Created: 2021-02-28 15:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b754ab7a4c18f0c3e7f7397f70f27af SHA-1: 7110cd730b859b596240603481cca272712a5f49 SHA-256: df613d7c69eeb86db313833ef87f9e15f78931405ba67411505548142f163052
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://dugedepap.ru/123?utm_term=how+many+chapters+does+harry+potter+book+1+have PDF link annotation
    • http://ubzvp.com/rawisawelot824es.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/36300199058.pdfIn PDF document text
    • http://fullpisetc.ru/should_i_answer_unknown_numbersfqrsu.pdfIn PDF document text
    • http://fortuneo-enligne.com/bopusibivezexejugenqiy2j.pdfIn PDF document text
    • http://navalny.design/award_function_ppt_template270j6.pdfIn PDF document text
    • http://hookup154.fun/saab_workshop_manual_900qw3yd.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/jesogomefozazakigololaxa.pdfIn PDF document text
    • http://cafe-cok.ru/61046054808351yg.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/6300217431.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/combatives_level_1_promotion_points.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/ohaPia0/balojonisudikisexoxul.pdfIn PDF document text
    • https://pewafusuzet.weebly.com/uploads/1/3/4/6/134662917/7442184.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/jyCbjei/43585655827.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/sun_tzu_art_of_war_book_free_download.pdfIn PDF document text
    • http://copyrightnotices-form.com/24709261190ghuvq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/jiliwofebopokor.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/ethical_hacking_tutorial_free.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_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 5752 bytes
SHA-256: 9ad76d0e63e714d6ae658c1270d997a3c057d3d1cacd56c0ae4ba42b0c5245ba
font_01_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 10000 bytes
SHA-256: 6760e67646cd381f2e6cc3e6a5127dda7939d6e996ea69145938900c925cacf9