Malicious PDF — malware analysis report

Static analysis result for SHA-256 50997bbe10aa7217…

MALICIOUS

PDF

67.5 KB Created: 2020-11-25 10:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 631d7a8973f4cedd1d9d9474467e249f SHA-1: 756b624cfc59d4d779bf8ecc141469e197fb2f05 SHA-256: 50997bbe10aa72173ddd01dfa812059089a17e1e2d54e1db51c607433c8830ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for distributing malicious content or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

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://traffnew.ru/123?utm_term=regression+line+worksheet PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fa069e007f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fa3ec1866d17.pdfIn PDF document text
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/496090.pdfIn PDF document text
    • https://vidulegu.weebly.com/uploads/1/3/4/8/134897898/1044c2a54a9c3.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/6716fe73835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1977506-2346-481e-98a8-a88bc348befd/69180648693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469df512-0dd9-4e61-a3d6-d5ba92276196/kigonipejopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c2a6dc-6043-4e18-ad37-57eb932fec6f/99191558904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f04b4a-1766-4b05-89b4-bc9b6b55bb66/51166513307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdfce7f-ae3d-4350-9990-9e2390712f49/trio_stealth_g2_stuck_on_boot_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a7a0d7-2797-4669-927d-766cabb06b1a/10779374533.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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 4900 bytes
SHA-256: bc34cf6aaed0a809a8722db1a5ac85423b6cf949f7ec81a18dfbed92cde5542c
font_01_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10960 bytes
SHA-256: 538d98760fa47afe61b9283b736cf6d207c766a45321589eaddbb476165ebcb4

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