Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8cf3fef9be536a…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 01:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ae4df9ccc47fbe723ddf7cccca75d4e9 SHA-1: 74a3bcfb3e6f489d403a2202fbfe2caf5e9f1f4b SHA-256: 1b8cf3fef9be536aa279db0210ce910d81f2c454dc12c2f3881dd69e64bcd38d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, hosting numerous external URLs on disposable domains, likely to distribute further malicious content or conduct phishing attacks. The presence of embedded URLs and the 'link farm' heuristic strongly suggest an attempt to redirect users to potentially harmful websites.

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://druttle.ru/award?keyword=alternaria+solani+potato+pdf PDF link annotation
    • http://priz24.site/81956884945v75kp.pdfIn PDF document text
    • http://mydenverneighborhoods.com/just_mercy_book_amazon6knen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_603401ab83fd8.pdfIn PDF document text
    • http://callup.today/31082121856j2trj.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/ANKdhf0/barbecue_sauce_for_chicken_and_ribs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_60095e1fbadbd.pdfIn PDF document text
    • http://prodson.fun/accp_guidelines_for_treatment_of_pulmonary_embolism3b9x7.pdfIn PDF document text
    • http://baltika-trans.com/bepakepibodufalenuzexjd8f.pdfIn PDF document text
    • http://tublitalia.fun/australian_pfas_guidelinesglqyb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419645/normal_5ff2ab623d2d5.pdfIn PDF document text
    • http://kpovli.ru/pibivofitezupukugugonuw3u2ri.pdfIn PDF document text
    • http://buybritishcat.com/stochastic_calculus_for_finance7ao33.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/I0C69hg/background_changer_background_eraser_cut_cut.pdfIn PDF document text
    • http://erkutungotu.com/24569428051yskkl.pdfIn PDF document text
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/80c4366c9664a.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/fimof_kukapezite.pdfIn PDF document text
    • http://xozonline.ru/921854354547biaa.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/6e85510eb44b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 5024 bytes
SHA-256: d29f216c248b10719378aa15c0eca29ea397abdec3722f5bea41acc204a9f593
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 10372 bytes
SHA-256: 4017505a0a7a4463bdcd1795b9b587bdc2af9e7d80c35cf35c1e9c44022bdcc0

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