Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6517b50bd9f8832…

MALICIOUS

PDF

105.7 KB Created: 2021-03-30 04:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6b4b7379052fe02f2c14f31f717b3af5 SHA-1: ea8a40c9d13e12655b28723a9ecee688782a6f8a SHA-256: b6517b50bd9f8832e0b903171b03a38f37d16f11801553a73fd38b6fcc950f7b
186 Risk Score

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 0.9998

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
  • 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://zajinet.ru/aws?utm_term=digitech+rp360+manual+espa%25C3%25B1ol PDF link annotation
    • http://wikowezenitezo.medianewsonline.com/gekebogasedejajexab.pdfIn PDF document text
    • http://lajulufubugo.22web.org/reference_page_template_for_research_paper.pdfIn PDF document text
    • http://immorta-cross1.club/42564303053pvge8.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/mumafobazig-luxozoseme.pdfIn PDF document text
    • http://winoraama.fun/gk_chesterton_orthodoxy_audiobook99zza.pdfIn PDF document text
    • https://nomozusosowewox.weebly.com/uploads/1/3/1/4/131453154/9912592.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/9332525.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/14546312192.pdfIn PDF document text
    • http://kalewolasufer.22web.org/pre_dive_checklist.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/943557d6-03cc-4774-8cdb-695fa4a34c32/64923320874.pdfIn PDF document text
    • http://felugibesixe.onlinewebshop.net/kelafowatulalorite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc6d041-9f31-4323-bff0-f49610aa2164/vovamexowoxadabanuxukolux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bb3d1c-dab4-4aec-bdad-487ee6092c33/when_did_christianity_started_in_rome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bac0df7-f571-4ad9-9a8b-42c4a364f9b9/nagijefux.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/687798177.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/matilda_penguin_reader_level_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cf42cb-61d1-4b6d-8875-0da332d979f3/40053212877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee0bf68-7a3f-485c-8a61-7c8d52e865ec/70794815440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb870034-9c7b-48b4-b1b1-fbec626d2980/83088111965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa4742d-43a6-4f62-9da5-610cbf305f7e/xiwul.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_off00015e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E22 6016 bytes
SHA-256: 35fb1125dc6a8ca79899a07aa716b3d2d5a72830c76fd722b1a275d3b0220af7
font_01_sfnt_off0001723b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723B 11712 bytes
SHA-256: b7f16abdc8c465f15ce465a6881b236a6df698c70700c2e3b3e10c527c0e8d35