Malicious PDF — malware analysis report

Static analysis result for SHA-256 3946bce8f1b15482…

MALICIOUS

PDF

76.0 KB Created: 2021-04-10 15:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 30d2df0d6d4194a6cde2f58f25744b6e SHA-1: 9a4cdeeaeda72410c31ac07a94296fe52605c481 SHA-256: 3946bce8f1b154827eb5f92fd64c0e0df3cfd8a8b9c22e84448f07fd203a6feb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential malicious redirect. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links pointing to disposable hosting, suggesting a tactic to obscure malicious destinations. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=soft+skill+vs+skills PDF link annotation
    • http://kafofal.mygamesonline.org/dubusujewitekiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_6014bb0993143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6026de08ccda4.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/action_planner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc7eb961ae8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_6001cac4983dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_60534ac037dd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/how_to_breathe_during_gym.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/10974658855.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_cf7614baa5874fecae7db1a6d2888d70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/791dcb50-d990-4d66-a027-5c60a76df107/eiki_projector_lamp_reset.pdfIn PDF document text
    • http://dexadusoxeb.atwebpages.com/sample_file_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8263fd-2c72-4cd8-ad25-14a2d626b5bc/does_just_dance_2020_work_on_old_wii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c3e051-ba81-4045-82ba-ac945e0e4095/96423431711.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_00471b5e91d34205b7d9c676554c077f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b6d7e5-6886-4ab9-9d09-2aa5ec29f1ba/why_is_my_smoke_alarm_chirping_and_flashing_red.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_0191c2746758479bb84d654681eccab5.pdf?index=trueIn PDF document text
    • http://dupepoge.onlinewebshop.net/sunbeam_heated_blanket_microplush_10_heat_settings_garnet_full.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_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 4680 bytes
SHA-256: 81ad0305b65678fd3464d7fe488d27a2e4bde1bf1a50dff4c99c85b6d0961911
font_01_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 10504 bytes
SHA-256: c57d11122a87b1fad1cef5c960821400e5f0a7f6ccb820bf8ad42894c3a0d9b4

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