Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33558e36fb0017c…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 09:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 869b12bfce877223c535721b6d59553b SHA-1: 46604148dbb77b3eefc1ea6fd3da3e7d2281270a SHA-256: f33558e36fb0017cc82eb8995b206e3ee9a4d085ae1df3a0a1a9aa3953ad38a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/award?keyword=gestion+de+cadena+de+abastecimiento+pdf PDF link annotation
    • http://cyberlife.store/what_are_the_classification_of_antibioticsa61g3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5ff9340a19850.pdfIn PDF document text
    • http://brumbum6.xyz/pomekitemojidupoxerogoiip04.pdfIn PDF document text
    • http://chambreop.xyz/121390607580gwuw.pdfIn PDF document text
    • http://flowerport.shop/31637539724ypt8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fd03c2a690a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_6017a4ac49f3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5fec42f4a3d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477183/normal_601db43563005.pdfIn PDF document text
    • http://shmelev.pro/google_my_maps_app_storekh76e.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/djbjijg/lugewobebuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/higiOme/digical_calendar_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603711c94c103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_604781251f0d2.pdfIn PDF document text
    • http://fortuneo.best/argentine_football_association_twitterpew08.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/MdqGhgx/infographic_template_illustrator_free.pdfIn PDF document text
    • http://tertov.xyz/babumenuvanobajuwumur11bbk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476432/normal_60019523c9412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59af73f0-4134-4839-87a1-08fb2e8aa53b.filesusr.com/ugd/e3c460_6a24523d3ef34bfa93f65005775d42f6.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_64fa580bb9a44848bb52d8e6839bd70a.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_f4b32b65d9554a0b8c78f768adc5b016.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_2c0725e4323c4c6db86d0cbfd641fc82.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_3577b86d5039415aa92174d43434ec29.pdf?index=trueIn 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_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 5344 bytes
SHA-256: 39a2a54e75be0b499f5a718239efdb256dcf27689c799e5ef5759a0e79e76a5f
font_01_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 12284 bytes
SHA-256: d0c2af4c427cee9deee2db6014665faec46e0a508b26aed14b1044396f1214fd

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