Malicious PDF — malware analysis report

Static analysis result for SHA-256 943802a2f7f97fc9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-17 09:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e4b2743f8c4f425830e22d10067faf9 SHA-1: 98f94bb9b0ace464f7b226599ea35a135a5ea938 SHA-256: 943802a2f7f97fc9865fa13dea64a253d5cd89ebf97c8cdad8743f5542033f34
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wix?keyword=ti+84+calculator+functions PDF link annotation
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/fojikuwomu-sumuta-zavubajudag.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/which_stock_broker_is_best_in_malaysia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_6023416cf1022.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/simple_reading_comprehension_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_6047b0e6a23fa.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/kakadeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_602dda2ef3659.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/Ygfjct4/horizon_nj_health_employer_login.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/pobofi.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/aff669251cfb69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_6018e287675eb.pdfIn PDF document text
    • https://venewosusi.weebly.com/uploads/1/3/1/3/131398385/pawol-kusumefiwido-gifizovupuvevis.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/Phvifhe/55485756904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_604b58000ccd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xusezoko.epizy.com/antenna_theory_analysis_and_design_3rd_edition_solution.pdfIn PDF document text
    • http://dasopikabuma.rf.gd/train_reservation_form_download.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/40950682761.pdfIn PDF document text
    • http://bukinajomo.epizy.com/virus_in_computer_full_form.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/windows_7_tutorial_free_download.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_6ffea81982614643924d3aba25534983.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_bbe26565e6e24f9f87a728ae81106d93.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_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 5108 bytes
SHA-256: dc4f96d284eda98e7031b5fdec95ddf14d7131638cbdcb250fd2eac00acb4189
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10524 bytes
SHA-256: a1836d8cac92005085ec5947ace8759be5339170364253ccb18fc6d5d558ef46

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