Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e8d47766c218de…

MALICIOUS

PDF

76.7 KB Created: 2021-04-08 19:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9558d8b5ce0da854676cbe4241a2f623 SHA-1: e0bf53ac00e74b9269ad9767fccfea7696788498 SHA-256: 37e8d47766c218dec0281959fd7be4e412e262029c760a707cbfa0abcb24d7a6
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 and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to multiple disposable hosting sites. The embedded URLs, such as https://mezovuduw.ru/strik, are likely used to deliver further malicious content or phishing pages.

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://mezovuduw.ru/strik?utm_term=is+mortal+sin+biblical PDF link annotation
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/mozibulimepo.pdfIn PDF document text
    • http://dvigatel.guru/698815431826a6xw.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/3908230.pdfIn PDF document text
    • http://groshyk.site/mawibejuxerigotifulugudex1i60m.pdfIn PDF document text
    • https://vuxijegeb.weebly.com/uploads/1/3/2/3/132302810/rokaxo.pdfIn PDF document text
    • http://kostlike.site/wivaxalqe9d4.pdfIn PDF document text
    • http://itawegan.fun/rewazedukalopuzodibahns7.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/jhieNan/lightroom_cc_presets_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/gfzgiJj/26317215076.pdfIn PDF document text
    • https://cdn.sqhk.co/tonatozi/zNmqihe/nuxutowo.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/c3e7b23ac93f2ba.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/duJZhg2/traffic_racer_2020_para_hilesi_indir_gezginler.pdfIn PDF document text
    • http://trastenmyqort.online/zasidezemavo88p.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/3b929f68-f4c0-42d4-a533-7caead29bef7/melekukerijum.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/mtd_20_ton_log_splitter_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/one_ui_version_android_pie.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/25131153437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3a3670-b710-4b57-84d7-952d44eb7bda/iomega_storcenter_ix4-200d_firmware_3.0.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86e8cf6-4f0f-4794-9547-e8a3c70ca166/what_is_the_purpose_of_a_general_warranty_deed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252b405e-225a-4f69-859b-87016efb5fe1/what_is_the_difference_between_taurus_g2c_and_g2s.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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5020 bytes
SHA-256: ff1d3a382fb6048c1948b7c1f4e47914c7d9c97cd089e4c1b4b368e7dc8ba8f0
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 10788 bytes
SHA-256: 9a96c24c086b0ea730d0a176e1937df05f29c77e00f6511943bc7b5e8d91d83d

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