Malicious PDF — malware analysis report

Static analysis result for SHA-256 de43c0b64a1618c3…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0e2f2ef42168d8ad546ef027a45807d SHA-1: b8df945eef741c42d584f821101c2c14e5e29c63 SHA-256: de43c0b64a1618c3463f4f82366a3463b605819713309b91b7124c66ad63f1e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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://jottigo.ru/strik?utm_term=how+to+connect+bose+remote+to+soundbar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421937/normal_603ad54c3c67a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5ff05d892d07b.pdfIn PDF document text
    • http://xosuvirakogaf.iblogger.org/how_to_troubleshoot_whirlpool_duet_washer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_606659e610f34.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/bsc_agriculture_books_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367305/normal_5ffbed43bd1a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekabun.myartsonline.com/lafegelelem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888109d8-58aa-4869-a3ca-20992f51dd5a/what_color_reflects_the_least_light.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/business_marketing_research_plan_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/wow_feral_druid_guide_8._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aec5a67-9847-4436-9e4f-f91e902c9d3f/04_honda_odyssey_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b923cf-21ea-4917-8fe1-26c53a7cc897/lax_max_new_generation_gaming_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c7b56c-cd02-464f-a65b-2cfef7b1a34a/2003_honda_rancher_350_2wd_lift_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/6302251706.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/91359349433.pdfIn PDF document text
    • http://fenajewo.rf.gd/gepenizuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478236d8-f85e-431b-bd7f-84cfc47f2aab/61310986757.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5248 bytes
SHA-256: 283ae89c327dabb6fbb8a9c4ec24313eb6ccaf9976c84e23854dab2b18a289e9
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10604 bytes
SHA-256: b8f9a9e4669206ca19a429f0ca539373d705ba859084f651e3de1ad6bebe75b6