Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e63599001f8481…

MALICIOUS

PDF

82.3 KB Created: 2020-11-11 22:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 123e08c5de8f90677ca81f7caa9e9c78 SHA-1: 1dcb19d42845feadd6ee788c632e4d6d3305a41e SHA-256: e8e63599001f8481864b92dde39f1bf77d80b4efa7e37b5e291847a17b8a4c19
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDFs, suggesting a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs likely serve as lures to download further malicious payloads or redirect users to phishing sites.

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
  • 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://traffset.ru/aws?utm_term=cv+for+teacher+job+in+word+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463810/normal_5fa7dc4f544f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8caae73bb86.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/3936ca.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/8734fbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5fa39920cac96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f99678a0ae32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f957372ec353.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/tadovu/60910315676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e8c910-a0a7-4e0e-a2c8-b1b9cc1a42c2/43176725754.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/ferikobiwexada.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_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 5324 bytes
SHA-256: ecc148ce3051a51c252e84ee2959f6cbf71865c090363ad13795196e5386d71f
font_01_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 10740 bytes
SHA-256: 0cea9c36ba910bce9c9605e0c58aecc80b4cb48577ba4d8c9442ce99cf447afb