Malicious PDF — malware analysis report

Static analysis result for SHA-256 864fb7c727a109b7…

MALICIOUS

PDF

74.0 KB Created: 2021-02-27 07:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aa965912c2c3a9549ddaa114aed86eaa SHA-1: 4f1d3bff526e43feae14ca104f2e2ee4fdfa5c47 SHA-256: 864fb7c727a109b7dbf2e4c9cda13fef5d284502a8e836b41d67e5f0f6f0f98b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs pointing to other PDF files, a common tactic for SEO manipulation or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage PDF-specific JavaScript for malicious actions, such as redirecting users to phishing sites or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=rhetorical+devices+and+appeals+letter+from+birmingham+jail PDF link annotation
    • http://instofficial.online/travis_scott_astroworld_zip_download67179.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/f8631c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5fddae4e57d9a.pdfIn PDF document text
    • https://majabowuji.weebly.com/uploads/1/3/6/0/136092793/50664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_602d1e5e1d225.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/gavuludolere.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/8b5f91aa.pdfIn PDF document text
    • http://bestsalestoday.xyz/proprits_nergtiques_des_pierres_et_des_cristauxfbhxi.pdfIn PDF document text
    • http://flowerport.store/sephora_face_sheet_maskhk60d.pdfIn PDF document text
    • http://itravelgr.com/sasanibinewitunebupoz6om44.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/ca79fdb521677e.pdfIn PDF document text
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/766131d44e8877.pdfIn PDF document text
    • http://good-production11.site/que_se_celebra_el_da_de_hoy_en_los_estados_unidos1ijmn.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/sazariwapa/buwan.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/the_carpetbaggers_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/keluzaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/bedolopodele.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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 5852 bytes
SHA-256: ae85a6012e5945c7d7986888b4700b013cc6559d00ba4d86003ef12e0e0e78e9
font_01_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 9972 bytes
SHA-256: 9bac2ef69b52f644964d399a9d0ddc2743395f01ab4999531b6e86350a136831

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