Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc0ee776455a19e…

MALICIOUS

PDF

69.3 KB Created: 2020-11-17 03:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b760d10139f963506f6d5f6ca34b4478 SHA-1: 934f52368ca42e2a0bc1ef22f295ce26b3e6605f SHA-256: 0bc0ee776455a19e86ca250092a8888a1f04b89769de0fa420003e8f080c76ab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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 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.
  • 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://trafffe.ru/strik?utm_term=esquema+oraciones+compuestas+sintaxis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f9af4ce81c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fb27de1a8d7a.pdfIn PDF document text
    • https://gokefezenomi.weebly.com/uploads/1/3/4/0/134040807/duxizexej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5fadc36c5392c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467004/normal_5fad699d8913f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_5faa0cdca1af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_5fae238eac689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fad6ea95f71a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f9ec0044bcd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f8f8a1a890a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5f9bd9ebebe28.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/4912a91f-0bd7-492d-9cf1-76d2f4a75509/62308180966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8e7f2f-a1b4-4c68-be87-a3b834126ff3/widexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419d0b0a-b1a3-4c74-b244-879b88da847b/plastic_texture_pack_1._13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae0d70d-f580-44aa-b4d1-8367f6ac83fb/litirad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc461c89-fc81-4f97-a811-3512535d893a/wanadivotujebavipuguviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19279dcf-f6f8-4f2c-b16a-364eb9d8b4f3/jamutasafovusotatonuwa.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_off0000d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 5200 bytes
SHA-256: 01c6af29554a55ec3ff057879a084e7499a5c2ff89f6caa7834bccd0b879efea
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 11828 bytes
SHA-256: a8128b4b259cce67e802f75ea02ae6e0740b5090c6b75a4e93e4bc0b775f60c7

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