Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78fc931ff1f97be…

MALICIOUS

PDF

84.6 KB Created: 2021-03-14 04:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5721aaeb682b1480938dff25e15199f8 SHA-1: 57312550886cc963f1cf24e8fd60b05132e30811 SHA-256: b78fc931ff1f97bed3ff2ce320fcc9417324b0d1b7aae7c1273bf00268597f23
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+practice+of+macro+social+work+4th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470224/normal_603f5a435d31a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fdbb4d689028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6034e2b558cd3.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/verifone_ruby_2_help_desk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_6044ae469e4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_60400e927bb17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_600ac79a0de72.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/bibazubuserorugewen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_602c1a72d2e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_5fd641277bcad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_602dd3d375d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_603b4c5ff1355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_600e2f632d328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_5fe8b7eb35054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60220f906401d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494669/normal_5ff3cd7518395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5ff3e635b0a2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_71ae4c346f0f4d888e3a7290b682236e.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_6fbac8ad820644a8a8ca8a6cb23cb8bb.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_4b4599b64c3542a59c5f4a5694763d06.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_3123f5a602eb43de9013976f1f0e390c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 2828 bytes
SHA-256: 02201fdaf2752f4422f7629c71039e5f766ffabbddac837aa70011d2fb945b01
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 5588 bytes
SHA-256: 9973d7749f9eda1849060b0bb9418c39db3805c88d6ecf991749cc269bb890fe
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 11136 bytes
SHA-256: c2a06780f32b0237c53517036c0261fa1668d34c27cf38271fe575a6f3b70e91
font_03_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 16084 bytes
SHA-256: 6793135c9d5f2d9402216549edf66541f87ac1c2d7f717693568b2625ec966b3

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