Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5512d281a2ecf8…

MALICIOUS

PDF

59.1 KB Created: 2020-11-13 16:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 232c7ef821753fe185ac0bfa20845675 SHA-1: 281939cf3b39630e34af5558eacb1058be158ffb SHA-256: fd5512d281a2ecf8d90415fc91e8f9ca08bdc85ca3f574dee3d68e0c27275fe0
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 are hosted on link farm domains, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or payload delivery.

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://trafftec.ru/aws?utm_term=calendar+planner+template+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f93b9ab9f466.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/5b0e2f78c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5fade41b7436f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5f9dd4b66670f.pdfIn PDF document text
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/debuxemimo_jabep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f96eab6e796a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_5f9b75e0ba5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870bddb3caf.pdfIn PDF document text
    • https://jexenixikejov.weebly.com/uploads/1/3/4/6/134632916/patar.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/purawuma/74483467159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0067e2b7-32ca-48eb-835e-f670879554b4/kikakubukifevulax.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_off0000ab2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB2E 4924 bytes
SHA-256: 0284b142d15ca52867de12e20493e9caf8a44fc1b3db636a0c1520a4111f256f
font_01_sfnt_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 10836 bytes
SHA-256: 6fd14929804df87fa295e3f4793b192f2846cb4861f22bf603d2d8ce0ebfab46