Malicious PDF — malware analysis report

Static analysis result for SHA-256 348c2f19e5c404c6…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 17:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8231dc1dcd839e0e89d541d0cb1d44e8 SHA-1: 9d7e40584a7f9d04ea6d9919266610130a09e558 SHA-256: 348c2f19e5c404c689552e2910df86c790c1860349b48d43e5fc6f42286ceb82
66 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 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 0.9996

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://nipisod.ru/award?keyword=cambridge+english+empower+intermediate+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475727/normal_60319c69ee1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_6028ec4c660be.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/el_capitalismo_es_moral.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5ffce2951be7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421640/normal_5ff8c66735665.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/humminbird_helix_5_di_gps_g2_locator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_6017b7695dc7a.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/budapest_transportation_map.pdfIn PDF document text
    • http://folejaf.mypressonline.com/dilizen.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/7bc31054-3f93-4662-8e06-ddbe7d3478d3/royal_crest_room_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/11998185249.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/ketewasikupaketowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7190677-6c48-45bf-b0cb-958a864ca388/48023206046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31a107d-1f13-43ce-b697-3a0ca683361b/learning_processing_2nd_edition.pdfIn PDF document text
    • http://jesitari.epizy.com/64073074106.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/bartolomeu_anania_carti.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/64897662306.pdfIn PDF document text
    • http://gafodix.myartsonline.com/spektrum_dx7s_battery_replacement.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_d08a397099204aa39861250f69f764f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d563e5d2-f576-4554-80ff-6e53d141768b/73293156355.pdfIn PDF document text
    • http://kojosire.epizy.com/16131214364.pdfIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_0109710931de4eb4a58ab8d8af284f9b.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 5592 bytes
SHA-256: b7e10cedff2e233ecf5f70025c39ce8f8d078cc3b23faf8e78b9d1976bd1a354
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 18180 bytes
SHA-256: 416112f230cb580399bcb4750dc2ead29e2a8649dcac6c0971f5b89bafd884c7

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