Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cb8021ffb6de2e…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 06:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f9815f164f22395b2c465bd1ae4c1a90 SHA-1: 555ff982f9989a6f49b77bbf578e1ea20ed43f70 SHA-256: 83cb8021ffb6de2ebedc90de8382fc56738e99d14ffdf32f672cc87e5b585f79
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, characteristic of a link farm, with some links pointing to disposable hosting. While no specific script was extracted, the PDF structure and the presence of numerous external URIs suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=megatropin+and+crevalor PDF link annotation
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/jivanama_tuzotiwoxujes_bugan.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/jgNijJ1/wutokofapazorowenunan.pdfIn PDF document text
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/fd23fc55a26f7.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/bagdigG/vactor_2100_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/hF0hhaY/snipers_hide_black_rifle_coffee.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/wenodoxevobakog.pdfIn PDF document text
    • http://wugafis.66ghz.com/associated_press_stylebook_2018.pdfIn PDF document text
    • http://xiletunekukine.iblogger.org/32059922805.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/8RyalpS/vi_append_command.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetoluwe.epizy.com/solving_radical_equations_word_problems.pdfIn PDF document text
    • http://jotozig.rf.gd/jarudujitewad.pdfIn PDF document text
    • http://totiwofosu.epizy.com/lerofoduwejar.pdfIn PDF document text
    • http://zajegugolex.epizy.com/free_treble_clef_note_name_worksheet.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 5128 bytes
SHA-256: 53978e412ac8f98c06f50fd4dfd32d19a2e9c78e08fd9670b12f1ddddb2eabb4
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 9984 bytes
SHA-256: e750f3db13b4eaed8180d3fdbff747c352a0bdb8ff62de5c093c97888abb4fe9

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