Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3187998c3d618ac…

MALICIOUS

PDF

80.1 KB Created: 2021-02-18 09:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a2f3bb48aa60fb50a2ffd2202a3fbc6e SHA-1: c5636a27e16f690bcdf5ae49ee8920a061267533 SHA-256: c3187998c3d618ac830f8cbc5e14a9ce4800da4de4fdef9dcdbc56ba8cf2e072
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://jottigo.ru/123?utm_term=what+book+comes+after+sunset+in+the+warriors+series PDF link annotation
    • http://bobatukuxoto.iblogger.org/symbiotic_association.pdfIn PDF document text
    • http://nukowivoxom.iblogger.org/mixuk.pdfIn PDF document text
    • http://hackins.site/tiruvedemalnqmyb.pdfIn PDF document text
    • http://worldhold.online/1637020956587aib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479254/normal_5fc74d4c53738.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/gWhjFjg/gikemakubofuzoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/bSixoQG/savikekurilogisebuvinazan.pdfIn PDF document text
    • http://weramixizagob.22web.org/27920297394.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/bhjggSt/final_order_card_game_digital.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/liguwubore/financial_maths_worksheets_grade_11.pdfIn PDF document text
    • http://waxasaxer.epizy.com/cocktail_semi-_formal_attire.pdfIn PDF document text
    • http://pexevogawi.epizy.com/bipizapawalad.pdfIn PDF document text
    • http://povusesa.rf.gd/felesuku.pdfIn PDF document text
    • http://fosufozixa.rf.gd/colour_blindness_test_file.pdfIn PDF document text
    • http://vabepevid.epizy.com/kuk_university_date_sheet_2019_b._com.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_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 5400 bytes
SHA-256: 08976cae5e1f1476c9e53e1ef1007b28d9625da2596b86d8e858dc36a94d4fe1
font_01_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 11060 bytes
SHA-256: 39d104193160632167b9d3d87e021b00d0ff2daf161b295bbb3946a247f6f46f

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