Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daf7c7d60b86f98…

MALICIOUS

PDF

80.9 KB Created: 2021-03-11 22:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f09c2c3c4a12394f106171c09ba6aba6 SHA-1: 507737562fb34eb116a862c184f3d6bdb2adcbbe SHA-256: 5daf7c7d60b86f98ea46175be04f7e4066c8c965364ad7aa7a4b6aa067339ad5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a suspicious domain 'botokaw.ru' that is likely used for phishing or malware delivery. The PDF structure also indicates it's a link farm designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/123?utm_term=ipcc+climate+report+conclusions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446401/normal_60358189e9146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444636/normal_5ff8bca117966.pdfIn PDF document text
    • http://maxedomuw.22web.org/dijofekijemuxezifiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wedizakur.epizy.com/using_congruent_triangles_cpctc_worksheet.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_41b7c1ade59b4521880bdc02d235ced4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/icann_whois_contact_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5c541f-a4a1-4837-a531-a82c07741c41/19976099562.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_e5e37c79c58a4be09201e773e333e528.pdf?index=trueIn PDF document text
    • http://peragodifi.epizy.com/bekefux.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_f4d5b4f1b676451d9b2198c8925cee1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a23528-e5f8-4dd6-a3e3-5c831c4e28a7/what_is_the_most_popular_book_in_2020.pdfIn PDF document text
    • http://jopakete.rf.gd/zuvogejufusewesa.pdfIn PDF document text
    • http://leremijidi.rf.gd/41713564009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c160290-9832-4bb1-81bc-48276d4cdca7/tabela_fipe_de_carros_usados_volkswagen.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_3f5f11febbfd4a2fa5d626a8fe2ecfeb.pdf?index=trueIn PDF document text
    • http://nezazokufuj.rf.gd/solid_wood_school_desk.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/writerbay_grammar_test_answers_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 4900 bytes
SHA-256: a810402650916b81e9bfdb5200787a0c61f9b56c5ff329be4bbb8ec7585ee0fe
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 10996 bytes
SHA-256: 9db0992b1d96e3393eeae91faacb326052cac4197582dff80883fa460ec2655f
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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