Malicious PDF — malware analysis report

Static analysis result for SHA-256 36954b26bc6876c7…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 05:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4422cae88c0a7a9a4de89adf8cb381c0 SHA-1: e1f6783576ea313f138646d464fd4ed91a4753d3 SHA-256: 36954b26bc6876c721b9b2f8afedd5e1bc69e1ba4fbf1d2dc568b65ed1da832e
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 0.9998

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 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://mezovuduw.ru/wix?keyword=directed+reading+10.1+answer+key PDF link annotation
    • http://vosajizegek.mypressonline.com/how_to_analyze_pretest_and_posttest_scores.pdfIn PDF document text
    • http://openchambre.xyz/why_is_my_mic_not_working_on_pc_warzonev5yjk.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/vevus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491934/normal_603865d8429cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_5ff3a01499a9c.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/bafawoxegite.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/12324248475.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/60312419906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5fce76ffc3b5a.pdfIn PDF document text
    • http://msertis.xyz/craigslist_oahu_dirt_bikes_for_sale_by_owner358y8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fe70201ec735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fc621ce2e66c.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/zijes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fd03b57c3f40.pdfIn PDF document text
    • http://mebelintera.ru/64221471788cibot.pdfIn PDF document text
    • http://marketitaly.info/kadixubazuwawimevijas54ik7.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/vemumuredixopetapusomate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ffc425-03cb-4d1e-a734-3fe6f9b19b6a/formula_para_calcular_el_volumen_de_prisma_triangular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e27dec-21c8-4ad2-b621-6168fd64af76/vefalevu.pdfIn PDF document text
    • http://ranitirunom.myartsonline.com/principles_of_electric_circuits_10th_edition_answer_key.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_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 5560 bytes
SHA-256: 81857878c2fa13cdce184dbc24b44a950456d74cf3063666b84790efdb6cdacc
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 11176 bytes
SHA-256: 1d653309df61138e5b5d63c97c65bd44d04dd77fd2cbf84000f82eed4d96fcb6

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