Malicious PDF — malware analysis report

Static analysis result for SHA-256 a468fa2cef0a7410…

MALICIOUS

PDF

81.0 KB Created: 2021-06-03 07:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a37ccb363adcad6e06885784b15bb7fe SHA-1: 143b820163866e43a1e92b4b0b1995b1bb00317c SHA-256: a468fa2cef0a741060c957519b6a9bf1c1048cacb64b77b6b60f3e6e4dafe490
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to movie search results, directing users to external URLs. The presence of numerous PDF links indicates a likely SEO spam or phishing campaign aiming to drive traffic to malicious sites.

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://chcial.ru/pbw?utm_term=percy+jackson+3+pel%25C3%25ADcula+completa+en+espa%25C3%25B1ol+latino+cuevana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473645/normal_600c165711016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5ff9097a02e92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5ff531d0011ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5fdad77ad6688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fe8b421bfc88.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481695/normal_60b6f4e655fc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ff70c7ecd934.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4407086/normal_60b4a1445ba5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_602900179a35d.pdfIn PDF document text
    • https://ropesafubisok.weebly.com/uploads/1/3/4/5/134515157/nibukonuni-gosekerimu-fuwizolena-zinowowumevule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_6053eda8cdae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_5fe96d38d4f74.pdfIn PDF document text
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/6063263.pdfIn PDF document text
    • https://wuwuxetu.weebly.com/uploads/1/3/4/8/134897280/tuxululerejanoxam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413987/normal_600886ebcb832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_6052d97397f9c.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/59f761f5-8d8b-47fb-9e19-30a37301864b/how_many_words_in_harry_potter_chapters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150596df-deed-4c5c-8899-cd8bff214a09/32792516981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e998ff99-2b66-4645-9628-d773af6f60f0/nedabafovorofuxodux.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_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 5812 bytes
SHA-256: d666a2221b3961b69310f19b2f1969c0b14a1c56f0f2d84a6cf320db44aea179
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 11864 bytes
SHA-256: 82dd30e5c4a1582866c3de1eec7f20ae3855ccac7a5127726aff95003a1ff203

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