Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcb8c831bb4f904…

MALICIOUS

PDF

76.5 KB Created: 2021-03-26 08:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6fd6e2a967c2fdf1d3749b8a4b03a14d SHA-1: bc34e6eb93453900043414e5279253f18b421fd4 SHA-256: 8bcb8c831bb4f9040ae84218815979d0cadd202f424f19185cf2c752ace215d3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=writing+samples+for+ielts+band+9 PDF link annotation
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/xuliwalubojitilefiw.pdfIn PDF document text
    • http://steelsho1.club/what_is_the_literal_and_figurative_meaning_of_soledads_fever3i2mg.pdfIn PDF document text
    • https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/c0bf3f739ce6.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/fgdIhgS/bts_dynamite_mv_views_countdown.pdfIn PDF document text
    • http://tiktokfrance.fun/official_badminton_score_sheet2lxvz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5ff18682bbf6b.pdfIn PDF document text
    • http://arfesopt.com/16874295655lzyyq.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_603441a2b04c7.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/ieaDaaN/xoxoxiwufevuvur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5ff227eca8e0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_181b22ff7cb144d79d9b6abaa4253814.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_7d0ffc06093c4c329b73a27cb00a04a7.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_216fe3756312425ea656f15046154608.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_faa5b349811e403699a8b71487b4cb58.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_25061df7308d42329d45adccd64d8105.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_461ab3016f814c12970fb073a60717d7.pdf?index=trueIn 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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5668 bytes
SHA-256: dde08f22976f1d02457dd42b2a6a462b8844b9140b4594ae0d429478ef1d4b75
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11168 bytes
SHA-256: deecbaa30a0e8231abf4b51edb7ece05b9bdc5337630a656009f277896c0e0eb

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