Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce3dbb6780a8fdd…

MALICIOUS

PDF

88.6 KB Created: 2020-11-09 19:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a83d38aa6f367c4ad3de72fb21b20f23 SHA-1: 13fc8e560db6f975f300326c9aecfb3af626272c SHA-256: 6ce3dbb6780a8fdd8a15975a590267d18c2a9eb1c57046acde573691d51cd154
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?keyword=youtube+tv+app+for+kindle+fire+hdx In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f8975c1a1401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5f994531c63ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f914587b79e6.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/f19c21.pdfIn PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/mafoniwenufij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f978deba9ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fa34325f1ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f961026608fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f9819b9363e1.pdfIn PDF document text
    • https://favesalaliba.weebly.com/uploads/1/3/1/3/131384568/xovikozeluf-xufumaz-taxigesexi.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/ec2a6eb7-3b8c-4f2f-8048-773d0548509c/sovogofiwof.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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 24932 bytes
SHA-256: de47aff555bf8b1ce696a8107996bc95b7e81ad6940c087458e070a680bdae34
font_01_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 5244 bytes
SHA-256: bf1fde2f0317fd5f6bffda4dd3717b5f8eefd6bb698758e7329a18fbfd434d87
font_02_sfnt_off00012e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E39 10732 bytes
SHA-256: 290b12985a9904de5c588d91b7d1a5344d360627057eb57ab977e380ddca9dbb

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