Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73533a1afaf1a26…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cfd24134aaa06e9b5c5230ddd42e9d75 SHA-1: 32fcfa147d105771b443b80200735727bbfbae45 SHA-256: e73533a1afaf1a266e28ed6ce7607fcd4ded2989239dfa0e3e4477bd5da44efd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to documents with SEO-optimized titles, suggesting a link farm designed to manipulate search engine rankings. One of the primary URLs, jumiwimov.ru, is associated with malicious activity. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=what+is+the+difference+between+a+relation+and+function+in+math PDF link annotation
    • https://kesuwevibumeju.weebly.com/uploads/1/3/0/8/130814845/dututenorefoveta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5ffe14bd74234.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/d7be5124.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/rurubojodofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5fe239e572266.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/nugixepovolujiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fd7931548d3c.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/5376758.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/bufapaw.pdfIn PDF document text
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/71dc9859c04.pdfIn PDF document text
    • https://xebanodax.weebly.com/uploads/1/3/5/3/135382800/ruposuva_jigeval_xeriturume.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/desenaz/transforming_rectangular_equations_to_polar_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3590990-e3ed-450f-b7a5-886928a801f3/roomba_980_battery_not_fully_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/casino_game_free_for_android_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3652771b-5902-47ce-9da5-7fa29baa41a2/yaesu_ft-7800_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78dd9b1-3a36-445b-87d8-feb33d8ab8f9/33668263936.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/trabajo_adiabatico.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/zoxesegumojibile.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/capello_alarm_clock_manual_cr21.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_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 5504 bytes
SHA-256: bec28ecde27640b73a2b75c309f45ff219d810511b38fc2ebad98cb9d86cb516
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11264 bytes
SHA-256: 4cb711b9986fa111e5dd27d75f79bf74fdc1a9353b597c9df3701ac4c32b64f1

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