Malicious PDF — malware analysis report

Static analysis result for SHA-256 51969e6b3e03ecf1…

MALICIOUS

PDF

83.6 KB Created: 2021-05-04 08:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1700efd8783dd2393f98d155499770be SHA-1: 12a4725aa90251d71931495e0944f18c5a0f713a SHA-256: 51969e6b3e03ecf1444ff714fe7464a725cbfbe54de572e8dd0e45f869b4d774
186 Risk Score

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 0.9970

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://baarspo.ru/strik?utm_term=managerial+economics+and+business+strategy+8th+edition+chapter+5+solutions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fdff620b30ac.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/rerigexatofebuvop.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/tojoj_zaposumifuwep.pdfIn PDF document text
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/ninut.pdfIn PDF document text
    • https://roxoxadedetep.weebly.com/uploads/1/3/4/5/134520556/4263294.pdfIn PDF document text
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/555650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fd79792c26ef.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/e3cc5a.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/4294746.pdfIn PDF document text
    • https://jawetixadal.weebly.com/uploads/1/3/1/6/131606755/vagagupugisuzasif.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/XOrF1ia/gakuvijefotofose.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/zefupubu_virage.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/betikepurevenam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_6026775221fba.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/jixediwov.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/ddcec58ee731.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/490fc8ab8.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/iaidvqj/christmas_movie_quizzes_buzzfeed.pdfIn PDF document text
    • https://pemowazazafal.weebly.com/uploads/1/3/5/3/135385959/1175048.pdfIn PDF document text
    • https://ferijadupegol.weebly.com/uploads/1/3/4/7/134705138/2065969.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/jihjdWb/ates_ve_su_2015_meb_incekum_esentepe_ortaokulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_d714894ed68b413182a631845181729a.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_a7f9dd33bda64904b4cdf2092eed0194.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_cd8ff30a0c994bda918ff10f51e8b059.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_5d13d13e61b24724afa90d6f2e52d817.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_40553d824a044235afcf33cfc0ffa8d7.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_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 6052 bytes
SHA-256: 21e6c47dbc41a33ff45b7180f63a3704f3e63cce64e9ed9fb2cd70f4c5292e40
font_01_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 12444 bytes
SHA-256: 085b8b653d64ed850b25bc00043dda3dd104a64ab496576e398cbf8339b0bf14