Malicious PDF — malware analysis report

Static analysis result for SHA-256 c727e5bec2ba7a68…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 09:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fc96f02aedce54123f4b22f757dff61a SHA-1: b2ad8e7eb49a2560d9bbe4bf32ce06ccbd6f86ed SHA-256: c727e5bec2ba7a68c584ab9fe42186cb4a259e2be9d6f428c6a38a7fc6282228
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=trevor+hastie+statistical+learning+pdf PDF link annotation
    • https://cdn.sqhk.co/kizulajeli/Od9xify/belewinojoba.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/broiler_chicken_production.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/hD3jiJz/zedugoduz.pdfIn PDF document text
    • http://xutusurekawidi.medianewsonline.com/before_i_go_to_sleep_book_free_download.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/hr54-200_vs_hr54-500.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/9jg9jdV/93412105613.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/jJJijic/33559588485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5fd8516c36c9d.pdfIn PDF document text
    • http://dafebukexov.22web.org/isoniazida_100_mg_bula.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/op_amp_circuits_solved_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/hha5Z2h/manager_tools_training.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_6000c2bb97420.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/jcjapgc/xawagorimusun.pdfIn PDF document text
    • http://pagefufobixew.22web.org/34524846280.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/hqgckdX/pokaninifaxofugimuxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_601d89b882dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/fgejEjd/teledapafafabagixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govabipisu.epizy.com/33877387915.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/valopu.pdfIn PDF document text
    • http://wuxipuretox.rf.gd/xenumobenum.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5424 bytes
SHA-256: f63acb941001b9364b0a02f9fd4aac2413e9f3e8256e53a622c505045050552b
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10484 bytes
SHA-256: e2d72f3b1f7cd759349767ae9a245dd09413279df5c70193869c3d40dff3646e

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