Malicious PDF — malware analysis report

Static analysis result for SHA-256 24311d65974fb222…

MALICIOUS

PDF

73.4 KB Created: 2021-01-03 14:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2b820c5ca3f47c6706d3ee5397003ac3 SHA-1: 13fdc8be66f2f447e5939eb2b0d9d301a9c6e1d6 SHA-256: 24311d65974fb22215f075d90bf3ebec38b61e9168c7fbd1bff8360885d29f3d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://cctraff.ru/123?utm_term=algebra+2+book+holt+mcdougal+online'. The presence of a link farm and the ML classifier's high confidence score indicate a deliberate attempt to direct users to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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=algebra+2+book+holt+mcdougal+online In PDF document text
    • https://cdn.sqhk.co/pinebiven/QieOjb8/bubble_shooter_classic_free_apk.pdfIn PDF document text
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/cadc96d.pdfIn PDF document text
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/5871007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fe9f11d78d83.pdfIn PDF document text
    • https://wipusometava.weebly.com/uploads/1/3/4/8/134846349/vukowadimitid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3ef066f1-9462-49a3-a333-e3eee7b78080/40518933627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304d3e02-d3bd-497f-b860-5befae997f3b/kikikafirupaguwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65201076-54f2-42ff-92d0-2360d25b392c/35977956841.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/complaint_letter_to_hr_about_manager_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603a1bfb-84b3-4e6e-af1b-7db0ca04a150/69180090297.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 5384 bytes
SHA-256: 4a7caf54518774e095d3baf8b09c48a65db78b6fbce291f089f1150afec499f6
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 10436 bytes
SHA-256: 4a712959e02311befc00e95af0264d82e954524fa5cf125a20eac497abb46af7
font_02_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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