Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c64b5b126a8e497…

MALICIOUS

PDF

70.4 KB Created: 2021-02-22 08:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 454a16b04585a89774d7bb925d6f3746 SHA-1: d066f29a39aaca7f27f83171c02ac3de2f7d164e SHA-256: 5c64b5b126a8e49774ce0d1bab0884743812a6eca90177c00d800c44cbb3871c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=accutire+ms-4021b+canadian+tire In PDF document text
    • http://gabupexijek.22web.org/beamforming_transmission_bfr_beamforming_reception_bfe.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/fkjfLie/cnc_lathe_machine_price_in_sri_lanka.pdfIn PDF document text
    • https://supifafal.weebly.com/uploads/1/3/5/9/135968022/jutur.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/qDpiaeE/rodan_and_fields_radiant_defense_new_shades.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/remineke.pdfIn PDF document text
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/1043594.pdfIn PDF document text
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/65a61c39b.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/jjgjJhf/81814076952.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/webipejonavuv/ciao_bella_game_online_free_no.pdfIn PDF document text
    • http://figupowogo.rf.gd/60867210404.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/mexikot.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/annotation_guide_ap_lang.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/financial_accounting_questions_and_answers_multiple_choice.pdfIn PDF document text
    • http://tapepoxawire.epizy.com/rudolijujoguri.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_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 5628 bytes
SHA-256: 1f4181189a454da67d20e4e62a6ece1d85050ee0c625efe276f64f113606affc
font_01_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 11740 bytes
SHA-256: 0e7c968daf0f5831b34f74dc2d55e3cd43deecd10da7cd29faa3216fe70025c2

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