Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1fea59ef1b4c5e…

MALICIOUS

PDF

92.4 KB Created: 2021-04-14 10:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 108c2ae226ab59cf7ad6cdf6280485e4 SHA-1: 9d84128974d9d998d8920dd667348862b71e07a9 SHA-256: 8e1fea59ef1b4c5e5cc1c4e6cdc44cb1e92b6f17f9fa912019bbeac7646e4f08
186 Risk Score

Malware Insights

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

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 0.9994

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://bologen.ru/strik?utm_term=how+to+turn+off+top+ice+maker+on+samsung+french+door+fridge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6020fb1348442.pdfIn PDF document text
    • http://yarrebitteh.online/verizon_ellipsis_7_tablet_battery_lifewb11z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_60234160ae15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fd8107b3e75f.pdfIn PDF document text
    • http://ukrinsure.com/understanding_the_duties_and_responsibilities_of_a_trusteeaamog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fef9cc6f153f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5fe5de34abe51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4ddbd6f1-350b-4d33-b75b-839adc379a36/dopazoverafupudenox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ffb000-3186-49e4-9ba4-69b778b7df71/chicco_keyfit_35_infant_car_seat_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669692fe-a8f4-448a-904c-c3ec9e983c74/99209422068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4840f6-2017-4be8-99b4-def689abc7e1/46461348745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff182b83-3497-4992-a123-0eeeaac062aa/50539011180.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_4c33be306e8043b4a1d44c8b70989663.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_937bfca1e0764cf2a6c4c4370313d77e.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_8e010e22a8364a379615924de0de5852.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_9eeb22eb5a274727aa58009cc2af1243.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_fc4ddbc4a2be4b6db0809aa35e804a9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ed1490-3498-4fe0-8605-daec6f1ec54d/study_plan_sample_for_masters_in_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939cbb12-e17d-4529-8acc-47357c643b59/20940543379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831b8e41-bb03-4aaa-85ac-f27312ad3c3d/75761194061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5459e2e8-8ef4-49e9-b982-d5f411f03f29/honeywell_8000_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61105746-3a73-4552-b3f6-a3e2d857348f/46729192066.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 5536 bytes
SHA-256: 0e162c3505c633a19be19625c02a8557aa67bc02b90d0e29d452d6b5e65c6fda
font_01_sfnt_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 11696 bytes
SHA-256: 767fc1256ffcf32073e5175095be423a54af91b1396585214c85df0a4c0988a0
font_02_sfnt_off000155e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3