Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eb3958cb3389e5…

MALICIOUS

PDF

71.8 KB Created: 2021-06-10 16:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 86588af85aa52aeea1efbbf72146af5d SHA-1: e6eb0cfe4e40cc96d02ccf847ee9a69985ab0dc8 SHA-256: c7eb3958cb3389e5637873c3e5f214bc62e5e73624888f6de40660fc56e86741
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a primary URL pointing to 'https://nomylo.ru/pbw?utm_term=dream+league+soccer+2019+obb'. The document's structure and the presence of many links suggest it is designed to redirect users to potentially harmful content, such as phishing sites or malware downloads. No scripts were extracted, but the PDF's nature as a link farm is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://nomylo.ru/pbw?utm_term=dream+league+soccer+2019+obb PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fe2e93a9ca18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366949/normal_6003d15b4dcee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_603abe01dde25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_5fee53ef5c94a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5ff9b874a9921.pdfIn PDF document text
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/7876491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_602a6de5d54e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6026a97d2cf08.pdfIn PDF document text
    • https://femowoziso.weebly.com/uploads/1/3/1/3/131398515/7518711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5fc9d028b0b96.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/8976348f-9d93-491d-860a-31b7c9b28eff/what_is_a_narrative_essay_in_afrikaans.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/145038264/antenna_regular_font_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2670393c-5bff-41b7-b673-7ef3a943ce25/kamasutra_book_free_download_in_hindi_with_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20443d9-3de3-42e6-97cc-19d361f6e4c4/cost_of_a_big_mac_in_2000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6db2f03-afda-49ed-8cae-a59b6b6b5f6d/98414343262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06876fb0-d58d-4ca4-996d-6f06b93ddf28/73648691892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8290f48-46e8-4e85-9c10-4fbbe730ad7c/kezakawajevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c762d42-dea3-4272-a1ed-3c136f546b98/how_to_burn_fat_mens_health.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144792756/who_is_the_richest_person_in_africa_now.pdfIn PDF document text
    • http://lajaweridadi.pbworks.com/f/selekugagu.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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 5740 bytes
SHA-256: 99fdbb54e8f6a77170b90006f2645e5c8d138cc18c692a47f76d03db4272fb3c
font_01_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 11684 bytes
SHA-256: d26c14668065d6bc3de85293d087b645d24fe1f51b28b44c32eeaa21d5c894de