Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f85b35009799a0…

MALICIOUS

PDF

98.5 KB Created: 2021-03-20 23:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 198eb7f6a922e511f8a22d3dbdc358d0 SHA-1: 9f57a97b10239c2ceb33cc15d90778fd0ddc9222 SHA-256: 08f85b35009799a07b06806e4cba24923cd529fca7376d9be1773943ac44baad
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=cercanias+plano+pdf In PDF document text
    • http://varistop.site/how_to_add_audio_track_to_garagebandmjb2e.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/sapopu.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/download_subtitle_divergent_bahasa_indonesiaujhfn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5fd1e87398972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479904/normal_5ffc76323eb37.pdfIn PDF document text
    • http://sacredname.ru/xagususuleluxasusilixuvhb84e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6002d1a940069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_602e0c9d5af4f.pdfIn PDF document text
    • http://bigops.fun/575215721536jj6.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/bodoxawajiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_60477dec7583d.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/aims_and_objectives_of_islamic_education.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/mineb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5fe1bee4bf2fd.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/arnold_palmer_hospital_case_study.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/rejufekadu_musemutisuw_ropagadebizudi.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://tejoratu.epizy.com/child_psychological_assessment_form.pdfIn PDF document text
    • http://mupisogedosido.epizy.com/15395805865.pdfIn PDF document text
    • http://livukuxuperum.epizy.com/wuvaxoligiluwig.pdfIn PDF document text
    • http://naremijex.epizy.com/cristiano_ronaldo_wallpaper_pc.pdfIn PDF document text
    • http://nawulariwataxut.rf.gd/auguries_of_innocence_analysis.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_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 4880 bytes
SHA-256: 1da4c9cf7522b7c48f8533c65881a85fc1a5d7e55b8d504d26acfc0e063496d7
font_01_sfnt_off00014437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14437 13008 bytes
SHA-256: 5fae3b6d12385a3e5316f42a87d545aea46aa0c021ccd45570292c86fb6d5a66
font_02_sfnt_off00016ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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