Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0cb937a582f007…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 21:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1191839337ebed5075edc4c19b42d360 SHA-1: acab4d281438757cd24bb1ff4f2d4eb714921d78 SHA-256: ef0cb937a582f0072fdaada126ae1bd468b67f9c6e1c8b5a71cd16f0e7cc2c69
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://gimoguvi.ru/wix?keyword=area+of+composite+figures+edgenuity+quiz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fcd3fd9b6578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_602dd16ae5991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_600d7c506976a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5ffcfea9117d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5fd72af82876e.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/23282573612.pdfIn PDF document text
    • http://fresh-ita.fun/julotesananawaripodozo06u45.pdfIn PDF document text
    • http://sawagemumavegon.22web.org/dajajisikex.pdfIn PDF document text
    • http://dressnbuy.com/pit_bike_engine_semi_auto5kqkh.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/fijajunomorthwpp.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/95992225762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koriwironawuva.myartsonline.com/doctor_zhivago_2002_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031cc562-7b80-48f6-a0ab-9d4fe2520d79/sorosewisuvaluxawag.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/job_offer_acceptance_letter_template.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_a7b290de31b54a15a12dace703a388c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8fe129-a90f-4fa1-9a6d-842747b08843/70692360185.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_0ae7e80c51e54e4fbc8c9caaa2ed86f6.pdf?index=trueIn PDF document text
    • http://timojodabemisux.myartsonline.com/how_to_change_picture_background_in_paint.net.pdfIn PDF document text
    • http://tojegazanet.rf.gd/acetate_sheets_for_chocolate_work.pdfIn PDF document text
    • https://dcd55a6f-f4d9-4ab7-9ea0-0dac4ffa5d6f.filesusr.com/ugd/f7cbe4_bf4f90621adc4cc3b643f4e1b41ba44e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53b9bcb-c3d0-418d-8684-862c7e5c67ac/the_100_book_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bbb91f-fe3a-403b-a1ad-168d92ea374b/review_aimpoint_6x_magnifier.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 5712 bytes
SHA-256: d5619ef8e1b276cb4ff7e20ede1fa7c0720b71018035859720086e14e4962e1c
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10776 bytes
SHA-256: 08b0df315cfe79571ffa19cafa0b1efda5ceb2fd603e09540796e250bfe26822

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