Malicious PDF — malware analysis report

Static analysis result for SHA-256 443d6a178d569a5b…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 00:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e493d9fa88d4ddab6b4b4dcf12f1358 SHA-1: 52d560be5de64c1e389722ff76729fa66726214c SHA-256: 443d6a178d569a5b8c5caa764448d69cbeff06de075ede4cce954aa36db0ede6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs, one of which is a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=gta+vice+city+ultimate+trainer+cheats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466153/normal_6016e2b6a3d61.pdfIn PDF document text
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/lilefomakom-solokolexalenag-boledebesa-duzajidodufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_60497326bb448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_601a131c5a21b.pdfIn PDF document text
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/xolilibarimu.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/1455073.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/sixak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_602b5fb861cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fc6d69c1ef63.pdfIn PDF document text
    • http://woxemezamuj.iblogger.org/lukoxuzitijopebat.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/42f8d717-f8a7-4c1c-a56f-eed0cf36c4ad/cracking_the_new_sat_practice_test_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e628388-6c9e-4598-ab48-be969b47e114/how_to_do_quantitative_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/24674096209.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/hp_university_b._ed_online_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761eb7ad-8dc8-4a3b-8585-a92eb022abd1/samsung_rf26hfendsr_aa_water_filter_location.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/rujadidiretunazamokodi.pdfIn PDF document text
    • http://gajovab.epizy.com/william_shakespeare_antony_and_cleopatra.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/28698633642.pdfIn PDF document text
    • http://diroxowevigem.epizy.com/favesutowojuzipeza.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_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 5232 bytes
SHA-256: 2fdda7d5154877d222678934e65d9a169c2c4260f9ec3d905a78a6fcf53f2254
font_01_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 11316 bytes
SHA-256: 30cfdd666ce14a3ed09f21da05d32e96a4f6d1b3ced4de212abe6284fe1679e9

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