Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72caff65a237476…

MALICIOUS

PDF

80.8 KB Created: 2021-02-18 13:36:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba3bde64f5cb216612df59afcf18bf07 SHA-1: ac761bcc60bd6393cbdfb5f18604e42bfe15ad8f SHA-256: f72caff65a237476031d88becd52b5518671c2819f8f62331fb8520f4e3754bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains text related to 'Trig functions chart unit circle' and metadata from wkhtmltopdf, indicating it was likely generated programmatically to drive traffic to the listed URLs.

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 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://jottigo.ru/aws?utm_term=trig+functions+chart+unit+circle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387715/normal_6023f5bc65055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_5fd97e1938baa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5ffbca026cacd.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/f225cd4edf33bd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_6009a356bfc73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422368/normal_5ff2f4079e70d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_600a44d4a8d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_600be7ce5cfdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5fd08b2c7f259.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/sevoga/laravel_forgot_password_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/mubimugex.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/bsc_chemistry_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/synergy_for_mac.pdfIn PDF document text
    • http://gafibis.epizy.com/xenororomep.pdfIn PDF document text
    • http://wosolebaxuwutux.rf.gd/zabulajem.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/lined_paper_template.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_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 5092 bytes
SHA-256: 4d67993050b6dbcc8085c5cc007ddf27c155c2f956f09707aab78f6182f86624
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 11352 bytes
SHA-256: 755bd4890a547dce2e1dc16ebccddcd24c50e31fdc4aafd1b67ae6360f03d714

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