Malicious PDF — malware analysis report

Static analysis result for SHA-256 571b7b613bca3621…

MALICIOUS

PDF

83.5 KB Created: 2021-05-30 09:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3e16f8f5ffe012261f9b3019d6c1dfc5 SHA-1: 9db850b33d60399f1a5259448538636444d2b89a SHA-256: 571b7b613bca36213d4f58861dbddd625de30bc31d536ba88be26f60cd0258cd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/123?utm_term=avoir+and+etre+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5fe79607c9c24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fec1945b74a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_60178325326ce.pdfIn PDF document text
    • https://nawixelufa.weebly.com/uploads/1/3/5/3/135317770/tilofosaximawu-tatikodetupitod-jajugijibedov-laxorulis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5fe152ee32f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_606640d85b72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_605431530a693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_6029e0da8cdf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_60316b97e4462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_602fe2e0a28a9.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/1696410.pdfIn PDF document text
    • https://lexapokugivida.weebly.com/uploads/1/3/1/8/131856754/5704896.pdfIn PDF document text
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/9622776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_6023e8bd84128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fcba094dfed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_605f8f3e2dbd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fc859b4c92ed.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/1560317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_605c1863e72a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fc57c98a8da0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 5088 bytes
SHA-256: 8c7af3419b1d38df5a6cc8a0de54c40e216cc266d93375ff1b9a40b5aa94c826
font_01_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 12900 bytes
SHA-256: 9ccc9d56590d2444f6e938a0ef390e21f479b80dd157e5cd1fb01d7b3dc5c3b9

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