Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f79204c66e8854…

MALICIOUS

PDF

86.6 KB Created: 2021-02-18 22:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2200345d4a632c3eaab61411c7a68987 SHA-1: 576297e05ffaa45cde2557219c35d0fbe2278875 SHA-256: 79f79204c66e8854a2984602719411c5339b613007562febb72694ca631f835b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or low-reputation platforms, suggesting a link farm or phishing attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious sites.

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 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://seumenha.ru/wb?keyword=i%20vi%20iv%20v%20chord%20progression%20songs PDF link annotation
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/ligopoxalevigesep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5fe07b7eb84bf.pdfIn PDF document text
    • http://bewiriseb.iblogger.org/certificates_awards_templates.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/momuzune.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/37bc6e2070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417988/normal_5ffa495966b50.pdfIn PDF document text
    • http://xifotole.iblogger.org/osrs_fishing_guide_99.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/jodabiladezot/english_articles_test.pdfIn PDF document text
    • http://putotapuzavip.rf.gd/english_comprehension_worksheets_ks1.pdfIn PDF document text
    • http://wubogijogazerew.epizy.com/35703111673.pdfIn PDF document text
    • http://jijetebum.epizy.com/lugoweguto.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_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 5092 bytes
SHA-256: f52c0227d488f01422f3df46a9e86d814fd891188a97d7977f54d91138695ada
font_01_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 11224 bytes
SHA-256: f6eb4fead6227cec27514e5984a2fb95ed7b4945f89e4676a089203df00ecb3d

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