Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4a49d13906a35a…

MALICIOUS

PDF

89.0 KB Created: 2021-04-03 20:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d0b52f850e7bba86e3d6a5bc551f55b7 SHA-1: 910ce3cec4157e5164fb9f680768c8906ed1accc SHA-256: ec4a49d13906a35ade44db39ddd87bc98d8dd1d86a9114fd3844b1d244062f32
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9993

Heuristics 4

  • 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://mezovuduw.ru/strik?utm_term=3rd+grade+states+of+matter+worksheet+grade+3 PDF link annotation
    • https://cdn.sqhk.co/wekaradukuve/igjawhe/87778230531.pdfIn PDF document text
    • https://cdn.sqhk.co/voravaxa/edEhdgf/rocket_music_mandolin.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/Fgeggha/gotijozamijikeluvi.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/jjcgeMU/6669129900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5ffd70e5226c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_6064e688e1765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_6056538b55077.pdfIn PDF document text
    • http://cosmostil.top/descargar_cantares_gallegoso6pyv.pdfIn PDF document text
    • http://huaweistoreukr.xyz/how_to_strengthen_your_ac_jointxpdg3.pdfIn PDF document text
    • http://cabinetshq.xyz/61997668442ext33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_6015e2c73e058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470221/normal_5ff5c4821e6d8.pdfIn PDF document text
    • http://madewithsunshine.com/povosetuponulolubakagazmgd29.pdfIn PDF document text
    • http://adminhalil.com/gis_tutorial_3_advanced_workbook11nw1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_60092267b487d.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/ge1jiCv/75480132626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501995/normal_6000f9385de05.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/d3bf8b13-1cdc-4f55-881e-0afe454a13cf/tovigovepizorupekiki.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/nkjv_chronological_study_bible_reading_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/badukutaditalijoj.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/hypertensive_urgency_aha_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3732a933-e7cd-4329-8a8a-1c58747a95ff/83288759327.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/zitowuviduzofujujaxizedaz.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_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 5516 bytes
SHA-256: 4fd0327982ba7c66f8fe22db60917e461c2e27be2c993c2f20934a6f13cb6938
font_01_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 12428 bytes
SHA-256: 496a77f2dca596ebae77283d80f2e5e48a49c5722a80e2c3f5ebab4677382388