Malicious PDF — malware analysis report

Static analysis result for SHA-256 185a51c38d9f4e0a…

MALICIOUS

PDF

76.0 KB Created: 2021-05-30 01:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d5785097d91c501e97d4cbab6daf4b5 SHA-1: 9d0ee1c3f6472578b63f72813ec28e92e5b2f6ba SHA-256: 185a51c38d9f4e0ad329c0b1fcefafa66952c2ea1152dbf7013985d983a3ed3e
156 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 0.9991

Heuristics 5

  • 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.
  • 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://soxebez.ru/strik?utm_term=is+it+ok+to+exercise+with+sciatica+pain PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451750/normal_605c00ce79015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5fc9e9007ebee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_60526363db3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_60693a19a01f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5ff30eb5ee4e1.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/422015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5ff357054deef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_600aad0a24549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_60586c4cbe642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458833/normal_5fc758c1bc827.pdfIn PDF document text
    • https://boripate.weebly.com/uploads/1/3/4/5/134590871/wininobonigez.pdfIn PDF document text
    • https://lazarenebuf.weebly.com/uploads/1/3/4/8/134885148/gobomoxixujarinogep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5fdeaea87177e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505771/normal_5fe1cb5435752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/221c027e-b4fd-49eb-80ad-c4652625f949/sat_math_equation_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8062c32b-fce9-4ba3-b941-de5d25724ec1/enteral_medication_administration_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954eda56-bffe-4414-99da-49535705b0e2/22586326968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82068326-e767-479b-b83e-6ab7af66570d/65953095308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350d5f81-6e70-4d55-ba0b-b5ad3fc0ebbc/nisen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d5a6a9-2b36-4f97-8326-38f36fd41832/auto_driver_install_windows_7_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecc37d7-9085-49bf-a8aa-96cabe4623b6/fisataz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c03265-28fa-4ef1-bd84-706ad999b09b/instructions_for_completing_form_ds-11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50dde16f-efd7-4910-9d96-5f7c9c0293d7/pretty_little_liars_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc4271f-6b72-4f66-8e3e-28f7c4862c82/how_much_do_club_managers_at_planet_fitness_make.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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 5148 bytes
SHA-256: da3ed2e035eec22301abe666d8851ed9a1bb0f7944d1c79771f0e5fcce5f86e9
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 9980 bytes
SHA-256: 716820c35a6d0923579c395e74f581d28920290d5cd4e17ab300a9f72c3b0bbc

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