Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3bc059035ef494…

MALICIOUS

PDF

65.4 KB Created: 2021-01-05 05:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 06cf9fe4d981806c712741044fac984c SHA-1: b3c39957d613ec5d76c1c29107913f7a0d54b4a2 SHA-256: 4f3bc059035ef494b357dcf40781d7e1f37c35f7bcc8d8b44ce1bfb59649ca60
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, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=scrabble+score+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fbd88154f259.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/2ed5e1e8b2aa026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f86f6d2be887.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/nazolima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5fca545d877ac.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/MFSDjbn/66726422676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f90bab1122ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fc0e5f88adbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5ff3c72b51580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f8a1b80c67d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5fd7ee90280c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_5fa77a7296da9.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/fb0721ef-c042-4cb1-aae5-678b414b3246/13165180717.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_off0000c473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 5488 bytes
SHA-256: 7d5a93e4c123c31dc1481c995340800056729c03606c6bf56381a3e7ede22913
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 9888 bytes
SHA-256: e94e673a8a5f2c627b33fbade25d811acb449a17525957f2d4de8cb0549d3fa2

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