Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6d227d3e48c6e5…

MALICIOUS

PDF

73.6 KB Created: 2020-12-17 18:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6267c6697572295211f77bab9bc8a7f0 SHA-1: c8c2713b2c2501fe8722a133cbd7be02e7982d52 SHA-256: 3f6d227d3e48c6e50e6a3f814917f5365eff58edd43eafc05f21ef82f6d99e6e
222 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a malicious redirector and part of a link farm, aiming to direct users to external sites. The embedded URL `https://cctraff.ru/123?utm_term=bank+holidays+uk+2020+may` is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to bank holidays, which, combined with the malicious link, points towards a phishing or scam attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cctraff.ru/123?utm_term=bank+holidays+uk+2020+may In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_5fabf2133b1ef.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/b6012bac.pdfIn PDF document text
    • https://juromimabosag.weebly.com/uploads/1/3/4/6/134644914/robujarepanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd7ab6e4d33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_5fb686309049d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_5f9dcea23780a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_5f9c61e331368.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/liguwubore/browallia_new_thai_font.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/afasia_mixta.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/igcse_chemistry_revision_worksheets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce45bc2c00fb1941508ac5/t/5fd1e974ae71ea6dd3223e7f/1607592313281/49779847151.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc519b07d0c8f249d5c1082/t/5fc7817ec953717e09db4485/1606910335373/penanefolizepeme.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/salutation_in_formal_letter_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41378adc-5c8d-4c38-86cb-a688cf9ade2d/javutopaxoponevowufafil.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/zinijij.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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 5460 bytes
SHA-256: 0522ffd32685f00fd58dba6cc740b76ee2d20a0019b1a3f7e7146cef516ec60f
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10748 bytes
SHA-256: 665999bcbeec1195bbd943312a607019b5ee0a0076abf2dfab966fd89fe7a8e2

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