Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f369a9267843d2c…

MALICIOUS

PDF

77.4 KB Created: 2021-02-20 18:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ee2fa50b0778c5776528d2a8ede24c9 SHA-1: 3bd9f7cdd5a3d185dd75d46b6f66a401f999a010 SHA-256: 1f369a9267843d2cca148aeb84c4a740154fec110f9baab45fd691d68218521d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. ClamAV and ML classifiers confirm this, flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a likely attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=it+stephen+king+quotes PDF link annotation
    • https://rowemuvirota.weebly.com/uploads/1/3/6/0/136089617/c12f9a6cfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5ff0f79fcbfc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fd8e26f50454.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/hiioXia/53134772137.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/AIlhijj/dudezopoxexufax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_6018320c193a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fee814d07fa8.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/jcghhdl/jadisizanowa.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/mejawiwomak/96370936760.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/assault_bike_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/three_addends_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/skype_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/69962146723.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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 4872 bytes
SHA-256: 036d82bc2ce76a03a42a1f486618e99294eb7476f7181504613ca876caef8942
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10748 bytes
SHA-256: fb39520defbe462bfd1da970e33b5edd61b3c3b4c62621b3b1844439953a4dad

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