Malicious PDF — malware analysis report

Static analysis result for SHA-256 3618d6b016aa10cc…

MALICIOUS

PDF

61.2 KB Created: 2020-11-17 15:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fb6b20b75d71a59e7772681d68a30cf5 SHA-1: 33d6d86a921a4cf632b327ebd9a5f09f7d58f3e0 SHA-256: 3618d6b016aa10ccaa3ccae3b40de830d442381bc2748202fd36b2edebb0560f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting a link farm or redirection mechanism to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate the document's purpose is to drive traffic to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=words+that+begin+with+master PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fad695facf34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fada6d8a1830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_5faf612e0e39d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f912674ec830.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/tovevukodijup_gupofewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f93fea975217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_5fa7f015e2e64.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/93265d1b-c89f-4681-b989-5c3b925ef0f6/75351003574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff22f885-acb2-4256-a54d-2bba021712c6/36694319418.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/32825099075.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_off0000b2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 5452 bytes
SHA-256: 54b62bbf8b176556122de75b7f9a909662e2157c89e453a812635d9594a7c628
font_01_sfnt_off0000c53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53A 10408 bytes
SHA-256: 700facb11ebe1ab7d3cb969dba693c8e67651679e6948b9eca292dbf03b8b3be