Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4b3bf077f67c7a…

MALICIOUS

PDF

69.1 KB Created: 2021-03-19 04:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ffc6a6db8b45b982d8667d0fa5246d0a SHA-1: be24f038cc1aa1ddb93af9be13d747c46843bc75 SHA-256: 1a4b3bf077f67c7a79157c2941fc49b9ea759b7111d3001c31b70fc21e7b22de
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, and contains a large number of external links, many hosted on disposable domains. The primary external URI points to a URL that appears to be part of a link farm designed to lure users with keywords like 'workout plan'. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/award?keyword=beyond+bigger+leaner+stronger+workout+plan+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5ff9afa2ccd3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcc1d1093043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_6032a9b37b4dc.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/6b8f2112.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/f37614b.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/5362266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446937/normal_5ff84b2b5d37e.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/1071627.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/huanyang_vfd_manual_gt_series.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/86ab3c88-d257-452f-9233-bf0733560f13/python_data_science_essentials_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298cd42c-2a07-4f0e-b722-099415ed2cbf/dijudavoreb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865a66a2-1659-48c1-820a-dcaffc57bdc0/best_buddhism_for_beginners_book.pdfIn PDF document text
    • http://kutijizon.epizy.com/performance_evaluation_report_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/85230935589.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/58380407139.pdfIn PDF document text
    • http://rufejawat.epizy.com/weather_report_for_nyc_this_weekend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fe455c-c3d1-4f31-8336-7542163d2f00/91911539046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea39994-6e6e-464d-a77b-5d73d4b9f5e5/all_american_boys_summary.pdfIn PDF document text
    • http://tuxavilewik.rf.gd/d_d_dungeon_master_s_guide_free.pdfIn PDF document text
    • http://natetiko.epizy.com/seating_chart_diagram_template.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_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 5656 bytes
SHA-256: 9b9d5a0c7b754979f0f74e10e3fb56355edd5f814cd5a3480ffe738a3af16a1e
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 10908 bytes
SHA-256: e8a7f1702b1ee2c5e5ceb700e3aa9e4b804737a7e177a1db4327cbd9f23762b8