Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d3724926a58c3f…

MALICIOUS

PDF

99.2 KB Created: 2021-03-10 04:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e128c1fe84f223440824963d2f02afb4 SHA-1: d8d8599d0a39c34902f7082f244aa7623e8d3864 SHA-256: d2d3724926a58c3f428b16ce28e700cef1d58392c36e2c4e145b94833c25b18f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior, suggesting the document is intended to direct users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=commensalism+mutualism+parasitism+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394082/normal_60100eff58ae6.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/8506343.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/66ee2b2c4806e81.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/tululilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_60123e6e7b9ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499341/normal_602b067a45cb6.pdfIn PDF document text
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/ed10ead60842d1.pdfIn PDF document text
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/5962449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_604130a780d92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ff3b9da3cff8.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/8902790.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/ridakavutukinoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fd3b2258a9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_603f37e44c3d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5feeef346c1b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_6025b21767ff6.pdfIn PDF document text
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/jaxuberatonizik.pdfIn PDF document text
    • https://tesebajaja.weebly.com/uploads/1/3/4/4/134402558/2fbcb34346.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/0994a706-df91-497c-abf6-84e338048846/what_is_ap_human_geography.pdfIn PDF document text
    • http://gigapexolazet.rf.gd/asus_eeebook_x205ta_bios_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9f279f-545a-46fd-b85c-3fe4de4fe41c/cloud_security_engineer_jobs_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4ed3ff-7167-4e82-9c49-05775795a27f/genugonoxujilus.pdfIn PDF document text
    • http://gobipubefosoja.epizy.com/microsoft_excel_advanced_functions.pdfIn PDF document text
    • http://bomofafavadu.rf.gd/sole_e25_elliptical_assembly_video.pdfIn PDF document text
    • http://mesovotugoteg.epizy.com/download_holy_quran_translation_in_english.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_off00014699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14699 5092 bytes
SHA-256: dcee1e98a089bbc2098a9fc7b209b0992fb99503722a468b60d20b2b9802f0ee
font_01_sfnt_off000157ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CA 11656 bytes
SHA-256: c39e8bd062aa04d89ea3f045636e744bfe4f0df79b799ab23bfb01796170bb4a