Malicious PDF — malware analysis report

Static analysis result for SHA-256 8780f16457340235…

MALICIOUS

PDF

76.2 KB Created: 2021-05-30 20:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8149ea754753a4cc1dcaa9243e3537a3 SHA-1: b280994c610a3e2e185a024d36c0203a55e670d8 SHA-256: 8780f16457340235cf2854d5eb647b992242c32a33f47a592da06db3ab4afb8f
186 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 0.9997

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/123?utm_term=cinderella+2015+script+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fd678a836ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_600eb4a8dbd2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_603234f4072fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_60013aa13bbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_6023d85c6685f.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/maled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_601676a1345bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_603d3aaa71a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fc5a156df7a7.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/voputame.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/8500f70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_5ff19d3f1b21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_601151bed444c.pdfIn PDF document text
    • https://xirixutikudu.weebly.com/uploads/1/3/4/8/134873033/5640767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_600f902de7815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fd6d9b7aae5d.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/df14250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fee9c2fb3e21.pdfIn PDF document text
    • https://rujurujubawupof.weebly.com/uploads/1/3/0/9/130969172/1443440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465006/normal_5ff80339b2642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_601b1d1ecc30e.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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5504 bytes
SHA-256: 1f72e2a32c8cb97c54c6ef323e729da232bd67ddbb3adaf4dcacbc8555e111b4
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 10312 bytes
SHA-256: 2e05c83f4953fed4dbeb014dd788e8eb8d40d47497c590bd72688791bdb22e5d

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