Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d06e4cfef4e49ab…

MALICIOUS

PDF

75.8 KB Created: 2021-02-12 19:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5d2067965552ac2f8377f9815496d96d SHA-1: cd164b8b0ed199d6bf593b3268ea1382f2d1694a SHA-256: 4d06e4cfef4e49ab427ec32ae189e39b4c74d033b1a6bcbc8fcd28a5b820efd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample for using disposable hosting and redirector URLs, reinforcing the phishing or malware distribution pattern. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

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://crophysi.ru/123?utm_term=estadisticas+y+probabilidades+matematicas+ejercicios PDF link annotation
    • http://priz24.site/addition_and_subtraction_of_polynomials_worksheets5b76z.pdfIn PDF document text
    • http://vkrowl.com/real_racing_dragstera7zjw.pdfIn PDF document text
    • http://sodahub.pro/915922693221gcw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5ff8fb5ebfe01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_600ee75bde83e.pdfIn PDF document text
    • http://ru-1.casa/xejanibujunawodcuh0.pdfIn PDF document text
    • http://kihepc.xyz/terukikunefixunifo5n3g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_600d30a3bd382.pdfIn PDF document text
    • http://dojepajeruzugux.22web.org/winzip_driver_updater_exe.pdfIn PDF document text
    • http://pinipuvazus.22web.org/chrome_app_free_for_pc.pdfIn PDF document text
    • http://mafewagidimu.22web.org/pudujisab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_600de98b7a3c2.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/ravek-bedava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_601e80977402b.pdfIn PDF document text
    • http://rating-bookmaker.ru/lonodogujexigoginamuxatupb74v.pdfIn PDF document text
    • http://bonusiotsbera.online/2015_kia_sedona_repair_manualao2p9.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://vimedunofonuw.rf.gd/efectos_secundarios_dela_metformina_clorhidrato_850_mg.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/gijovi.pdfIn PDF document text
    • http://pakimafagi.epizy.com/mixorurozub.pdfIn PDF document text
    • http://kedokonox.rf.gd/27162848551.pdfIn PDF document text
    • http://mujunuge.rf.gd/egypt_flag_coloring_sheet.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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 5176 bytes
SHA-256: 9367017f1fbd75d1426a74f9c229b5ed6226e2c70890fd33cce2f12532e2ab78
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 11720 bytes
SHA-256: 1b7331aa739a82f69eded0900fe086ad3008e4a0474d9a8c7cb91b9d7be04bdd
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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