Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa4928ed8eafe76…

MALICIOUS

PDF

73.4 KB Created: 2020-11-24 04:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d97ee19ecc0e2fc99bde292e9f94a487 SHA-1: 9f73ef2db99a29960eedbd9efb94758b0402ac6d SHA-256: cfa4928ed8eafe76f95cbb09dfb92a9ebe32bb9f8389c072970439c2871f0e38
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one identified as a malicious redirector, disguised as a sheet music download. The presence of a link farm and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links suggest exploitation or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=appassionata+sonata+3rd+movement+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5fb7e98ca84ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fa7950871ae2.pdfIn PDF document text
    • https://kopadababipa.weebly.com/uploads/1/3/4/5/134502609/jizomul_kapijiva_foxit_teberejaroza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_5faa38d8b9a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5fa5101d6ea3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fbaccdbe58ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fbc433721cd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d6960ec-5690-4bb0-9e94-4878ed87954c/63217010241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a531846-8de6-4741-b1a4-d7c9ef5d1dd9/63421482167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c29a65-0619-411a-aae7-d00daa9f8c9e/purosoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd83927-29fd-484c-9bb1-3b601a1e8eff/choral_repertoire_lists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32c8082-8442-43ac-af8a-7914d15f921a/13248767512.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 5496 bytes
SHA-256: 98c0ea4652eb72cb91b854d3da9525dab95a2103f0754f70f8a7ca6ac346ee68
font_01_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 11952 bytes
SHA-256: 91bf4b896aae51245a2656a98373bff5b5db4c316108602b643cbff5750d90f6
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9

Open this report in the interactive analyzer, or submit your own file for analysis.