Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bce0d84b5a1878b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 23:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 916e11a9d8edf3df2f861cbc85757293 SHA-1: 53ba922e1c0c5d86cbbc4a9d422c775858663d9b SHA-256: 4bce0d84b5a1878b5820557205bd1fa5356402b99fffb76665ddec023a339cd2
186 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 0.9997

Heuristics 6

  • 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 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://lozipotod.ru/award?keyword=descargar+caballo+de+troya+7+pdf PDF link annotation
    • http://mufosubofamar.mywebcommunity.org/alone_together_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/gikFLuK/42901983319.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/hhhdjiB/vapinato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fd36b9361d6b.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/39656785510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fcbf33e1ea7b.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/jejhjdi/free_ringtones_for_iphone_8_without_itunes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_604b1bf6370d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_604ed5255dbcb.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/coxOKYX/ufc_253_date_and_time.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/yiiticK/juzopupova.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/hjgjhex/sawozatesanum.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/wLiejaT/mavasiwabuwizisoge.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/aicrTig/tefejilaporitumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_600900d968f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_7727d73a516e4a208fac1d8a2368088b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3a841a-fe90-4537-b548-d0efc9bd6fa3/electrical_engineering_technology_major.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a6282b-3e73-4a39-926a-d578a05a4e7a/93041064344.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_e861d04b6f9441f487336ca135dc41d2.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_0b22717a162f4724b602f255277f6cc7.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_a150c76cb7744f2c9b18ecc2ca8efcd6.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_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 5644 bytes
SHA-256: 651c5b96865d549ba40e23cfd1c76cd8a355fbf72843b0e4602615cbbd7cef13
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10736 bytes
SHA-256: e577145ccbd0c17c2c6031d337d39179f47bd3947d253a2654e85f0c3d7ff328

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