Malicious PDF — malware analysis report

Static analysis result for SHA-256 0598dfd3336fd5bf…

MALICIOUS

PDF

66.6 KB Created: 2020-11-11 13:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3baec65d7cd2512daf3ce3b38ff8d7af SHA-1: d3da6613834bd4e04f828a35c526032877aff32c SHA-256: 0598dfd3336fd5bfb0240a76116539e9d4b34dd1ea0a5b785683a9ed0315cbec
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafftec.ru/strik?keyword=kahoot+app+download+for+pc PDF link annotation
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f89e5c239f6f.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/riwuzemapepawed_pobibatas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fa4e81a1b67a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f90a2f5a9efd.pdfIn PDF document text
    • https://tunejipurebodo.weebly.com/uploads/1/3/4/3/134342488/4948930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_5fab6c84dce44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f8b49fd5c445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f9d3ce150846.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/tetofamuxulil/the_golfing_machine_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/wefibekelalinikokotijukan.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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 5124 bytes
SHA-256: 6ead87ed17e59b9274d8dc217be542e1047d9013164782b15934025ee39c5f9b
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 10400 bytes
SHA-256: ba012fe8854ead72fdc3118a133c048ff15fbbc42f4897979eca4e573bf3184f