Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b33ee1fa7f80c2f…

MALICIOUS

PDF

68.3 KB Created: 2021-03-02 22:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 82b3eb1ed787bd19508aa231fcca539c SHA-1: 73a26ad55a720fe40ef9461bc62bff845df08623 SHA-256: 9b33ee1fa7f80c2f894b32ea09c7c639d22350a707a0de50630fc6feb37080d8
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=occupational+therapy+examination+review+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_6020fbf5a3149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483623/normal_5fca809eb82b8.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/tewugitugire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_602bf97d12ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5ff4d2d296c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_600b8cf20b700.pdfIn PDF document text
    • http://xsale.trade/pefulikeweriravepuburb9v2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6038e4ecda7d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff9fcb92ec9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385421/normal_5ffb04b8df96a.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/f3996bfc.pdfIn PDF document text
    • http://pushbiz.fun/698868004241kxuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/87217834027.pdfIn PDF document text
    • http://tosuniwenalob.epizy.com/pusoj.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/texas_dmv_written_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/dezel.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_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 5740 bytes
SHA-256: 0a38fc944fb5cb1839aeebd56a4103cf7453f4dd6fd4c4984561c7bedbcc23b4
font_01_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 10744 bytes
SHA-256: e63b2235f18c93993e9045a8d9cd17626a0a672c0f967e98b63736bc8124a4a2

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