Malicious PDF — malware analysis report

Static analysis result for SHA-256 924aa9b08c545451…

MALICIOUS

PDF

76.6 KB Created: 2021-05-02 19:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba7708505c81dc7c8d1742d4c42796a6 SHA-1: 9282731e95aeb3e88791d99865bd2f8914ce8bfe SHA-256: 924aa9b08c5454518e2fba262d990456dc969385fb5d2a9822981aeeb1319f2a
126 Risk Score

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+to+build+rainforest+jumperoo PDF link annotation
    • http://poxumanavofeboz.scienceontheweb.net/frog_embryo_development.pdfIn PDF document text
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/3713353.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/dvjfawe/comedy_central_tv_schedule_tomorrow.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/shdgi43/sejoranotozakom.pdfIn PDF document text
    • https://cdn.sqhk.co/tigepukeri/IsU8lie/toleg.pdfIn PDF document text
    • http://grinallex.shop/broken_age_ipa7row1.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/76703011011.pdfIn PDF document text
    • http://show-visitor.xyz/3364747436gdcl4.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/5346288.pdfIn PDF document text
    • https://vowinerini.weebly.com/uploads/1/3/4/3/134385114/pidavixuterulekakamo.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/LLX3wid/30496711190.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofunadex.myartsonline.com/7th_grade_math_probability_worksheets.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_f59c0e62fe67443f84be4300209ce11a.pdf?index=trueIn PDF document text
    • http://wugetad.myartsonline.com/is_mercedes_gls_reliable.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_628e680b4590405bb636d06ce666be72.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 5456 bytes
SHA-256: 6051054c748c23b231efcb6e3d93252b01cbda7500e2ad9054eef05f0f25bfe0
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 11260 bytes
SHA-256: b9b7924f4335b2748baa1ab9877e1382fac62a143a32e1b3c01091bdc527cb26

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