Malicious PDF — malware analysis report

Static analysis result for SHA-256 001df4ada4fd1c13…

MALICIOUS

PDF

73.1 KB Created: 2020-12-28 13:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c0ba91be41dbd9354fcfd32f2452a1b4 SHA-1: 7b826d11152830a5ac380412fd0116756e314a35 SHA-256: 001df4ada4fd1c1331c88861711fe4bc6958eaf9f7e141a445ddb2ed02709db4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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/123?utm_term=daikynguyen+v%25C4%2583n+h%25C3%25B3a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453718/normal_5fa09ade8b99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f9812ae1f7e5.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/tiwimudugumidula.pdfIn PDF document text
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/e17c8e54071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fda25aac5821.pdfIn PDF document text
    • https://cdn.sqhk.co/dozumapufa/ahf0CN0/76650263455.pdfIn PDF document text
    • https://pisubudanumiz.weebly.com/uploads/1/3/0/8/130874058/1934526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fd31cd81cb5e.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/yhhhfjh/ai_programming_with_python_course_drives.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/tizowodifi/accountant_resume_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800801f0-0631-4b8d-a511-706d5e4419ce/22063125412.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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 5268 bytes
SHA-256: 483c6ccc05b9cffb9559f872adf6b89557056e9874429557d04a67b225d39b5e
font_01_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 22464 bytes
SHA-256: d11ac38006df53702ecdd83b0214b0a5c0e4cea5b47ad4400841e3d6e1deefdf