Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5aa3543d94a0990…

MALICIOUS

PDF

67.4 KB Created: 2021-01-17 20:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9ecadb2b4993496c05b5724515df7d94 SHA-1: e4a30ef83d22f0f9c57a211ff8dedf367462c935 SHA-256: c5aa3543d94a0990b1216b467c5004d407c4aa3a4f9c1889b156bee4e994328b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It functions as a link farm, containing numerous embedded URLs that point to external domains, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' in one of the URLs indicates tracking, common in phishing campaigns.

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://traffset.ru/123?utm_term=cave+bear+5e PDF link annotation
    • https://site-1172709.mozfiles.com/files/1172709/lugojule.pdfIn PDF document text
    • https://site-1166657.mozfiles.com/files/1166657/venitenexusebavugupatuz.pdfIn PDF document text
    • http://bogaxusamukuxid.22web.org/zumatafakosodiropafum.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/ziwanupodewovo.pdfIn PDF document text
    • https://site-1177290.mozfiles.com/files/1177290/ios_app_store_icon_missing.pdfIn PDF document text
    • https://site-1173857.mozfiles.com/files/1173857/modes_music_theory_worksheet.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/bawskee_1_zip.pdfIn PDF document text
    • https://site-1176998.mozfiles.com/files/1176998/briefing_meeting_synonym.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/zasepo/xafofasemokaverunusi.pdfIn PDF document text
    • http://peworesafasar.epizy.com/red_and_orange_background_free.pdfIn PDF document text
    • http://magikid.epizy.com/dobizi.pdfIn PDF document text
    • http://mosararivifu.rf.gd/20575764866.pdfIn PDF document text
    • http://faxumev.epizy.com/comments_for_school_reports_secondary.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/62493493768.pdfIn PDF document text
    • http://jajapelemazibog.rf.gd/commercial_lease_agreement_template_south_africa.pdfIn PDF document text
    • http://filazit.epizy.com/free_able_wedding_invitation_templates_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/melulefoka.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/whatsapp_for_nokia_230_dual_sim.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_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 4700 bytes
SHA-256: e0e1766941221bb08ecce125926b4164ade5867b3b1965ab3676743a26517c56
font_01_sfnt_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 11208 bytes
SHA-256: d4a1dd060e0b12c2bfe4fa911299a40fc2776be25bdda790f9064a65c9aa68e3

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