Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b08be2915704ab…

MALICIOUS

PDF

69.8 KB Created: 2021-01-13 16:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c2a7f8ab4c20c002d4b866926248644 SHA-1: 83758a52805822bd54cc739c7e9fdc49cf46f47d SHA-256: 69b08be2915704abdb1dac54159535f38c3495947fcfc923ffb92e1652121667
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'cctraff.ru'. Another critical heuristic indicates a PDF link farm, with the first URL pointing to 's3.amazonaws.com/jeromopelurab/kofirewekisepawef.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/wb?keyword=waluigi%20pinball%203d%20model
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fbd2c00559d3.pdf
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9bc70eeb485.pdf
    • https://sawawinuta.weebly.com/uploads/1/3/1/6/131606003/zasazosev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jeromopelurab/kofirewekisepawef.pdf
    • https://s3.amazonaws.com/dovulavavo/mupusifegonulazog.pdf
    • https://s3.amazonaws.com/sedowedi/abbyy_transformer_plus_kaufen.pdf
    • https://s3.amazonaws.com/zedilegol/curriculum_vitae_example.pdf
    • https://s3.amazonaws.com/muxozuvalubi/fitbit_charge_hr_operation_manual.pdf
    • https://s3.amazonaws.com/jozaponi/tivizikixuregekumizuzir.pdf
    • https://s3.amazonaws.com/fibesezati/2007_jeep_compass_repair_manual.pdf
    • https://s3.amazonaws.com/tosego/simple_action_plan_template_excel.pdf
    • https://s3.amazonaws.com/zifozujiwi/niratusogorizabunosu.pdf
    • https://s3.amazonaws.com/jotizifime/autocad_mechanical_2014_crack.pdf
    • https://s3.amazonaws.com/miledu/free_online_calendar_templates_printable.pdf
    • https://s3.amazonaws.com/jukoxisojow/sample_answer_sheet_for_ielts_listening.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c9.bin
2ebf8f916c9ff248c2fde2da9cbac3f9187405b23b046693d87806f5c578c5fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 5324 bytes
font_01_sfnt_off0000e5da.bin
da0c47fc092c38a10fb3e1dfcdb666ed58c712103c8e4ce0676065f15c7dc729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 11216 bytes

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