Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c30f72f84691f9…

MALICIOUS

PDF

82.9 KB Created: 2021-04-04 03:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61358dfcb02578ad494b51f8176079bc SHA-1: 64cd9cc673d929b6cea0c2ce5d044bd870ead4b9 SHA-256: a1c30f72f84691f9af6039df96b93f19d8eaec227034efd59c3ba075e0c0b321
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9251

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 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
  • 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://lozipotod.ru/award?keyword=ethylene+glycol+production+process+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384143/normal_5ff50bc5e2cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5fd5f08f78e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_60559431c3907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_601315c9607e4.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/lafunasisux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_601fe9565ed9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_60066d1577f9e.pdfIn PDF document text
    • http://gubadif.myartsonline.com/dell_optiplex_gx280_vga_drivers_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757a5e1f-07d2-46ab-aa6b-0ebe9cf5fe0b/take_five_oil_change_dallas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3a9f87-1881-4aba-9f60-7ee54af8c86f/what_are_the_rules_for_a_driving_permit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5710cf32-d5b8-4a15-8b0c-5dea27d7febf/flaxseed_meal_recipes_for_breakfast.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_90ef566cf92647b2a4ba08bbb39a75d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3fa7bc-842a-499c-87d2-d6cfbefe0438/iso_27001_lead_auditor_study_guide.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_8c042626857042d0953c1e04d349a37a.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/blue_eyed_devil_lisa_kleypas_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0071a9ba-25e0-4643-859e-1a5ea7f76130/vodopirak.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_0dc69832a502470baebe0dc0563215d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff389d8-e3e6-4a59-a9e9-07bad9b98f2d/93676319377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a59d313-1f71-4f71-8b5d-31f550c06a3c/wd_my_cloud_iphone_app_not_working.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_0901d914a02c4d67969ae01f9b747d37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d927c8c-7476-4cfb-9866-a6f288c061fe/20348290975.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_2945b1a435664c8a9a88e21576acc5a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acd838f-9e6b-4f99-b25d-e444a51dffc5/98036390870.pdfIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 6492 bytes
SHA-256: cf6bcbaf462759e04676f8989e7e87ed4d43c4317550ddbd0c5684ab0bd17b73

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