Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9304c77e5cc9f17…

MALICIOUS

PDF

78.7 KB Created: 2021-02-25 22:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd18b33cd1148e09f6f84e0d0cdd3a77 SHA-1: 93adea2ac280b48065192674833b3f0745aa4780 SHA-256: b9304c77e5cc9f17e82c8c35b481092395ab0210c7f026b1c3a1c292672619e3
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 hosting, and one specifically linked to a search term for 'my passport ultra 1tb price'. This strongly suggests a phishing or scam campaign designed to trick users into visiting malicious sites. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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://maypoin.ru/strik?utm_term=my+passport+ultra+1tb+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480745/normal_601ef5174549d.pdfIn PDF document text
    • http://kaxasujigunabew.iblogger.org/7274608512.pdfIn PDF document text
    • http://japisonaxem.22web.org/94347210442.pdfIn PDF document text
    • http://wumofuzusagumo.22web.org/1-100_multiplication_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fdac9e08ff0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_60084348898c6.pdfIn PDF document text
    • http://sapapubusil.22web.org/zoxinezosasemezi.pdfIn PDF document text
    • http://tehnotop.space/simulacion_promodel_ejercicios_resueedwxp.pdfIn PDF document text
    • http://copyright-notice-ig.com/drama_triangle_quiz41wf9.pdfIn PDF document text
    • http://tulimosigen.22web.org/buwizunisedapoliv.pdfIn PDF document text
    • http://xiwotafajiloluf.22web.org/13902542322.pdfIn PDF document text
    • http://armlur.space/xasetisorusuwelobapegavuhybdy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5fdb5ba25e991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waminakukivexo.rf.gd/85752081781.pdfIn PDF document text
    • http://wigazimo.epizy.com/4226799572.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/memezoxibotawaxadumijabij.pdfIn PDF document text
    • http://balubusepebibi.rf.gd/ielts_essay_writing_question_answers.pdfIn PDF document text
    • http://feferabi.atwebpages.com/how_to_unlock_a_hill_rom_bed.pdfIn PDF document text
    • http://nulesuli.epizy.com/vinatufinesozogimutoj.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/2601861583.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_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5224 bytes
SHA-256: 045ea1e2192d78f41d04e80f81499c23f7965365ba08c3cf5767e7a82449907c
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10760 bytes
SHA-256: 46478c8a4a452c081754fa03935fe39196482b1357e301ca6ff06eb21ad3c1ba

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