Malicious PDF — malware analysis report

Static analysis result for SHA-256 818647336cfbc12b…

MALICIOUS

PDF

70.1 KB Created: 2020-12-22 18:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7ce0efd4f12c3ec8d74cba897b0bdd8c SHA-1: d38df4f185770846accd3855e8762bacd7d038a6 SHA-256: 818647336cfbc12b7c64f3938d82641fbe2747edc66ead9b19d76da3cd038ccc
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 the document's primary purpose is to direct users to other sites, potentially for phishing or SEO manipulation. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of malicious links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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=kessel+female+hockey+player In PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/zekiseziligef_vuvawafovonab_pivafiwojawajet_fosozev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f8ac835024a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5fcf3e62dc293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f8af0131de3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5ac1588c99b6d37c7e4a8/t/5fca9818f1f62239f188e7f1/1607112728625/falujofudinavurer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42cf8a0-ffd5-49b9-aae8-59d7b61178d4/pojugiribaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de07878-abe8-4e8f-95ce-a6331837d41f/58410522075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7fc830-2fe7-4341-a24d-a06871c9e361/vejegikunesamenodojumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfc64d4-7fdb-4c25-b379-2a2e134d19b9/heat_transfer_worksheet_doc.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 5388 bytes
SHA-256: 627c21afa65c6aa681e2f0c5236d314fb5ab00dbc2be59b8c1df21e87bef57cf
font_01_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 10572 bytes
SHA-256: caba282ec2cba7246de1b957e6163810fc16ff9a2c58d1631383d7be19b610ff

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