Malicious PDF — malware analysis report

Static analysis result for SHA-256 25312f2169862fcb…

MALICIOUS

PDF

70.3 KB Created: 2021-01-10 06:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e00aed4c56603e2329ed9be05eb56352 SHA-1: c1df7352c25ec5312fd9b78ee842907feffdc05c SHA-256: 25312f2169862fcba7f84bfddb7d136f62a4d1998059c66da9f8eda70115c5f2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one pointing to 'trafftec.ru', suggesting a phishing or SEO spamming attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=1965+inflation+to+2019 PDF link annotation
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/2777519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f8b85ab411f9.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/0cd061c12492d6.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/foneniz/kankakee_state_park_waterfall.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/bullett_raja_full_movie_720p_khatrimaza.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/78025980826.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/wibetigofakedunag.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/lurutikaxer.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/notepad_formatter_css.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/cash_flow_statement_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/32262228333.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/effective_communication_skills_for_managers.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/lomakomaragedov.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/51525367693.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/naliduzaxadajijew.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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 5152 bytes
SHA-256: 226e6ce0736569aaeb0185b02d3f4a1864b9eab66ac98a7624c6eb56b22fb9b4
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10972 bytes
SHA-256: 29632067c4911b877bea04f23a89cf5269b61d92d50b25e205990ac95f9357cd

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