Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4dce71a82a2cb0…

MALICIOUS

PDF

78.0 KB Created: 2021-02-02 17:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 023780ed91ba55e96dc9d9fcd3e5705e SHA-1: d341192df85384cf4c49122159284aba4cbf4dae SHA-256: 4f4dce71a82a2cb0cc73144a8a400748fc1a67d5532c5ab73a8adbe47420258b
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 flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and link farms, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

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://crophysi.ru/123?utm_term=benchmade+940-2+vs+bugout PDF link annotation
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/kuwevufivorolol-rixubarozuvobaf-dafip-mejaxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448129/normal_5fea3f845b1ee.pdfIn PDF document text
    • http://girlita.space/from_the_inside_out_hillsong_lyrics_deutsch49yrn.pdfIn PDF document text
    • http://the-job.ru/mirolalelw4svl.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/bixigoxasadaz.pdfIn PDF document text
    • http://allrecipes.pro/mitsubishi_pajero_2003_owners_manualybvbs.pdfIn PDF document text
    • https://jidevamomibowi.weebly.com/uploads/1/3/1/4/131437101/8670018.pdfIn PDF document text
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/f8620df22c3.pdfIn PDF document text
    • https://xomaribimufad.weebly.com/uploads/1/3/1/1/131163516/1812453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fed5b2743de3.pdfIn PDF document text
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/nijunegu-weresakazurixop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwapazuxesara.epizy.com/avatar_english_movie_free.pdfIn PDF document text
    • http://mapulikilep.epizy.com/how_do_teachers_pay_teachers_create_worksheets.pdfIn PDF document text
    • http://sevezogare.rf.gd/stone_crushing_unit_project_report.pdfIn PDF document text
    • http://tejujusaruke.epizy.com/bavobuxa.pdfIn PDF document text
    • http://potolonufe.epizy.com/update_windows_10_version_1803_offline.pdfIn PDF document text
    • http://vorawaforase.epizy.com/21397564310.pdfIn PDF document text
    • http://xojazexodiwosi.epizy.com/sum_of_arithmetic_and_geometric_sequences_worksheet.pdfIn PDF document text
    • http://pekarenov.rf.gd/bazovituzifowugepedem.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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 6024 bytes
SHA-256: de30414c190d8e225059fd43c4a181600c08a032b5313d6f09cd5254d8a7f5b2
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 11284 bytes
SHA-256: b963f248979d68f6abe8b41c98e2b96c32ed32695d3b08ad48eff3e322ad205d

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