Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc50b96929f61b8…

MALICIOUS

PDF

63.4 KB Created: 2020-12-31 13:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66898235072d41d15db11abe7fd1b38f SHA-1: dae0d6f20409605325f7d3af799ef2c140f115d1 SHA-256: 3cc50b96929f61b89fbfab82642b4704ae29a6ad4d15db28f02628f084c0c0f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such link is 'https://trafffi.ru/123?utm_term=pinewood+derby+kits+home+depot', which is likely part of a phishing or scam campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=pinewood+derby+kits+home+depot
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/69287c9de2.pdf
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fae15b15b4f8.pdf
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/gujasuj.pdf
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/gorobowugut.pdf
    • https://wigubidukes.weebly.com/uploads/1/3/1/6/131606651/9202689.pdf
    • https://fomoxejuj.weebly.com/uploads/1/3/4/0/134000143/pased.pdf
    • https://sobegivi.weebly.com/uploads/1/3/4/3/134311910/3948486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf2a6f1b-38cc-41a0-9569-d06f07236d3f/45509777774.pdf
    • https://uploads.strikinglycdn.com/files/5bf677d8-ea3d-44ca-b804-fab26088ebfc/listen_beyonce_vocal_range.pdf
    • https://uploads.strikinglycdn.com/files/8954bff5-982d-4377-ae3c-1ac49836d896/62492477925.pdf
    • https://uploads.strikinglycdn.com/files/d5b6c039-0d27-4f78-82ab-fefaa9015834/scarborough_maine_school_board.pdf
    • https://uploads.strikinglycdn.com/files/b4045519-8c18-4bd4-8682-927054193133/bimusave.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_off0000ba53.bin
00b132d6c54e0d5a5e91a93086f8957d9153b2c3dc2741f912775c054fc5c766
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA53 5356 bytes
font_01_sfnt_off0000cc71.bin
fa27aa09d6228bea9dbd80de02af084541707d79e209523585167cfc7c6b9540
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 10696 bytes