Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c80c92976db3ca0…

MALICIOUS

PDF

85.0 KB Created: 2021-03-30 04:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 04d7ba1663bd46b073f833676d08a861 SHA-1: 5b6cdb03e8d1aa37c16f34e8e468a6aa809b587d SHA-256: 6c80c92976db3ca0cbfffbc10e331490f06beb0159623c433af5b0288130f783
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://dafemum.ru/strik?utm_term=can+adhd+cause+aggressive+behavior PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416332/normal_60268160edc9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5ff531c3ed036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_602480a42c9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_5fe7e519b1304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_60431fefb2d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fd22753b433d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6041828e11c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_600ce2e9af143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_60625c7c80b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403131/normal_6024a07a4e0c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapizodipe.myartsonline.com/afcat_2020_answer_key.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/army_supply_nco_board_questions.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_a1e9d92237cd460f9dbbc9e5537473ad.pdf?index=trueIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/why_did_my_electric_stove_stopped_working.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/ingersoll_rand_ssr_ep_150_air_compressor.pdfIn PDF document text
    • http://vunonam.atwebpages.com/introduction_to_calculus_and_analysis_solutions.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_51e465b9a0aa4c19992c63c2b684d105.pdf?index=trueIn PDF document text
    • http://ziwemasux.myartsonline.com/62013438164.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_a8fba2073be0458196c56e9d4a79f896.pdf?index=trueIn PDF document text
    • http://gozuketitara.onlinewebshop.net/sonagufaxuvufugepojeti.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_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 5276 bytes
SHA-256: 6d4312b4bf0e6ea3c2fc31193dd2fd60da9334e4c1ce656a1417613efb79b45f
font_01_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 10724 bytes
SHA-256: 1e808a1ec6e30cc1030e4232e863bab031378d644a43b583c083f85f3e5dc2fd

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