Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea77515ec5e3957d…

MALICIOUS

PDF

66.3 KB Created: 2020-12-22 20:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ffd9f5fcb369fe0f38e5a60e96633ba SHA-1: 3e52cd0395c6089d6eae375d3bfc478c044c1f6f SHA-256: ea77515ec5e3957d9cf45bee632218d16a732786f314c0309db3cb3fef1aae61
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating malicious intent. It contains numerous external links, with a primary URL pointing to a suspicious domain. The ClamAV detection further supports its malicious nature, classifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure suggest a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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=hallelujah+chorus+free+pdf PDF link annotation
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/5763415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f99d52ecfd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f97a5a2db692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5f92efac3ed6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f870ffde99f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5f986a3e61de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fd1be5521edb.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/ribowexulo/vufazolakiwupoxid.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2b8fd7fbea164c2cd44a/t/5fde42a3a478394ebc9b5bca/1608401572424/inverse_functions_worksheet_algebra_2_answers.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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 5280 bytes
SHA-256: 5d38bc7b6074dabba8cd87d4948a5d98443ec9782e76c0548456ee7481698e10
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 11532 bytes
SHA-256: 9a0ba8ccd12e55545840c26d2e957f1481ca254dbce9aa6d894a769be032e966