Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cfe5917d834161…

MALICIOUS

PDF

70.5 KB Created: 2020-11-23 16:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e643136c95aa8df71c05792b5666a00 SHA-1: 234ea088dfcdff2bdd50f8b7a8c3622faf0f9f70 SHA-256: c7cfe5917d834161e4258f856f0eaa779d97b52f507cd0e0197d684f99f87055
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cctraff.ru/123?utm_term=bsf+lesson+4+day+2+joshua+13-14 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_5fbba8e61ad4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_5fba6cbd54bdc.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/3393008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5fb640ef35242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8c3bb602eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479451/normal_5fba7147efe5e.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/mozirolinitaje/wutikibilazazo.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/one_pass_continental_airlines_miles.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/confirmation_receipt_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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 5592 bytes
SHA-256: 73d2c24963c170168ee37fb5fe20c47e2cb007d29c74d63d4c24ec81fd98516f
font_01_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 10776 bytes
SHA-256: 2a063a913f9f8d0f2eab91cdcb0982340262df58d4616f10d106ca8b58c96528