Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54761e966ccf989…

MALICIOUS

PDF

69.6 KB Created: 2020-11-10 11:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c36fb54c71354dc571293fbaf561f39 SHA-1: 78a15c66059e2cfbd737e5e8317fa7e724da3258 SHA-256: d54761e966ccf9893835f42adfe1257f76df9852b1bbf64b1f02d2d071def1ef
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search results or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?keyword=software+engineering+code+of+ethics
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f872844c2d2f.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f89bc36634cb.pdf
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5fa88fb1e1f32.pdf
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5f9e768d98ef2.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0832e9f0-652c-4c7f-bfc4-05c8278e856e/vapak.pdf
    • https://uploads.strikinglycdn.com/files/458a9fc7-25ba-4dcd-ad38-25c22905ffd1/44595970411.pdf
    • https://uploads.strikinglycdn.com/files/158572f3-9ce7-495f-ab98-297b474ab117/15782735824.pdf
    • https://uploads.strikinglycdn.com/files/248f27c5-1792-4901-a7e5-526d950888d1/3679578020.pdf
    • https://uploads.strikinglycdn.com/files/ccf780e6-5f42-4933-b4f7-b3c01bc3e35b/duxukexijulusumixovoxo.pdf
    • https://uploads.strikinglycdn.com/files/9c5a3457-6a64-466b-a9f3-6cc94506adbf/rolling_girl_mp3.pdf
    • https://uploads.strikinglycdn.com/files/bfdece97-4b14-47d1-9922-560efc7d6228/liwulimokeluxuwekemotalow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d309.bin
0b0627876aa1ad97953b15ec40d15fc6e72240683961e6eee28eea9504a885c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 5444 bytes
font_01_sfnt_off0000e59f.bin
cc16c8bf4c09470bf376fd52a630f0a790c7504ba13c0d8ad7c41efeb9a642c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 10464 bytes

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