Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d34aea2201e1a4…

MALICIOUS

PDF

66.0 KB Created: 2020-11-19 16:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3d099279da20ae3218f1c014536b15ab SHA-1: 166ad6adc589ca67ffae78c72bd85cb70a2acbf8 SHA-256: 69d34aea2201e1a405fa537540c033ca3af2c18869e6cebf8f9a6ac418fe7260
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?utm_term=the+last+lecture+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5f92f408cbdb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f91d888cbd4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5faaaeeca731c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f877bff19d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fb40195c6e8e.pdfIn PDF document text
    • https://guzejanum.weebly.com/uploads/1/3/4/6/134681017/setut-lexukas-sudegiziguki.pdfIn PDF document text
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/xebanufo.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/xebibo.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/4461744.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/josinudage_kefamigomalug_pulopunenalex.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/zodutobo_mevibores.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/de1c547b-0bf0-4355-aac3-2628ddea0dd4/58710507225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddecdf9-b405-40da-958e-73c6fb79e17e/towelroot_apk_download_for_pc_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d25797-2ef4-4efa-9913-419ba8d589a2/the_real_crash_peter_schiff_down.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_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 4992 bytes
SHA-256: 61e1045cbdd3e41540e2ddf8d74c0adc6a26628885d7c2712cd15d2b9f247279
font_01_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 10404 bytes
SHA-256: 30a29d4dd472cb54de59fc21cf848ffd3be4628910064e123bb9fe92cf0aa53a

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