Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f8cd65a9f0608d…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 16:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11afc66e307bcc017711a239660e179c SHA-1: f09bc8624ff04715dbe8af40266e089a0372052f SHA-256: 73f8cd65a9f0608d0970e08ea53fa0382c3840ecb0cf085f29a5e20e48013c3f
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('maypoin.ru') and containing a 'sig sauer p229 9mm caliber x change kit' query parameter, suggesting a lure for a product. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute links across disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://maypoin.ru/strik?utm_term=sig+sauer+p229+9mm+caliber+x+change+kit PDF link annotation
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/3042678.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/3lL0gtP/91288382185.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/8927279.pdfIn PDF document text
    • http://sikutamilom.iblogger.org/arduino_due_library_for_proteus.pdfIn PDF document text
    • http://com-signto2.xyz/free_worksheets_for_grade_1_english_grammarvl6xu.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/bodumowego.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/gigotutika.pdfIn PDF document text
    • http://sadipetuzaw.iblogger.org/lexajisavavomejedazomedeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifabemifuxiza.rf.gd/99853130733.pdfIn PDF document text
    • http://jariluwalube.epizy.com/43878097695.pdfIn PDF document text
    • http://rukaxamusotaz.rf.gd/92366739685.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 6012 bytes
SHA-256: ef29e185aab790c65713340315d44fabca38679a78e9fb942ee42b2d9271ccb4
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 11380 bytes
SHA-256: a587ec0bdfaf5ba8833fd8e54dfcceff64ccab4e6c27f4a7afc9e12811e6aad2

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