Malicious PDF — malware analysis report

Static analysis result for SHA-256 9357b7356de32e90…

MALICIOUS

PDF

74.3 KB Created: 2021-03-27 09:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9dc23c9e2dbfe8dc1e53bc29c7383b42 SHA-1: 581810a75eba784a9f2f56a29eb2b811840c3eae SHA-256: 9357b7356de32e90bbcebbea9133813c4bd7d6512b9e362cd266911417f35ad2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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 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://jacksth.ru/strik?utm_term=how+to+identify+something+in+a+picture PDF link annotation
    • http://timinome.getenjoyment.net/81870255176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_602da25063b74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe50f807f025.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/6563251.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/zemupozogowo-fadavi.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/dupuxemexedugufazozifaguz.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/52943793271.pdfIn PDF document text
    • https://kajugolake.weebly.com/uploads/1/3/0/9/130969904/lasodizu-korabumi-roxutejagesado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451021/normal_603265421cfae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498883/normal_6008dc3a3b49f.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/mivipomipof.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/coronary_anomalies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6018e6312ebdb.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/edwards_and_penney_multivariable_calculus_6th_edition.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/5849572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8aee3b0-83ea-4a0d-b8f9-524a85b41d10.filesusr.com/ugd/105b34_7f38bfe0bbd4430490e5e3a47a1c5374.pdf?index=trueIn PDF document text
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_5e5b3f4d6e2644b887d02c2a64967c04.pdf?index=trueIn PDF document text
    • http://safedoguno.onlinewebshop.net/addison_wesley_chemistry_11.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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 5692 bytes
SHA-256: 19ffa4e452296d2191d1683a99bfb14cc7d45cb79a6b37eebae8bd2ca41b5cbf
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10748 bytes
SHA-256: c057f5f0e5ed97c0de81f2f69a54ff781ba144b5bc5e3d6b0b8e6883b0f8a73e

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