Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a458be5e47f1bd…

MALICIOUS

PDF

79.8 KB Created: 2021-06-11 05:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f349af8ec5736dc5e4aea2274d1baf00 SHA-1: 80eae6a3aa5f204801fb6a27022c41a76aa01af7 SHA-256: 10a458be5e47f1bd0360e1a9e9b2be8584d07fafbf4bd3e01cbb5faf4622b1fb
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 0.9991

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://nomylo.ru/pbw?utm_term=bullet+journal+ideas+drawings PDF link annotation
    • https://zipunutegegur.weebly.com/uploads/1/3/4/8/134884248/f359e257fb5e457.pdfIn PDF document text
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/79953.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/8cadebdd2bf23b2.pdfIn PDF document text
    • https://lidawutoroliv.weebly.com/uploads/1/3/1/8/131872032/fomude.pdfIn PDF document text
    • https://xakijukozuxa.weebly.com/uploads/1/3/7/5/137503217/baxomuwizade.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/7340161.pdfIn PDF document text
    • https://bifurizikekoson.weebly.com/uploads/1/3/4/6/134690439/5be3747dee792c.pdfIn PDF document text
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/torud-tibuberixe-vesozu.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
    • http://kevuxezedila.pbworks.com/f/where_to_get_xbox_360_isos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587edf00-ec1c-4030-bcd4-b1c6864b207e/christmas_pictionary_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19e54b5-5b4f-4831-b52f-2e3859eef9aa/mclane_edger_carburetor_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755a21f1-f419-4b64-8946-4de7ae940d47/funizutonav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ffdfb4-df84-4a69-8e54-e19dc5bda801/learn_basic_electrical_engineering_for_diploma_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888fa210-5dce-4e68-9837-491f67915b26/philips_norelco_multigroom_series_9000_beard_trimmer_and_body_groomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66881d4-0316-4365-b7d6-9cd312faff4a/5e_spell_sheet.pdfIn PDF document text
    • http://jubujefaj.pbworks.com/f/zazutuwetajegixafuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bf3d26-0c65-48b6-9cc8-00b2a09cf558/nirajukigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf6217d-882c-4a9c-93a4-cb53ad2aa9fd/american_military_base_frankfurt_germany.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537499fc-ff82-420c-8a06-67063e7272a2/senemezureburuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9885f63f-1295-4e7f-9ee8-5c9e9481e8c0/borinimelowuraxugopojux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d962c1-7d0c-4583-b2c0-838d90126ef0/53269043444.pdfIn PDF document text
    • http://wuxewuda.pbworks.com/f/nani_telugu_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2a0b61-eef4-4ed8-9a80-fd3abb4852a6/rexagadizafenerutajisupab.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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 5092 bytes
SHA-256: 0dfc4938aedd8f74cb450f57cd086e54237f18160223dda9122edd8f4c1b593b
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10648 bytes
SHA-256: 656a3656b59219069ccabd51fcf2bcc0aa3d4ea15ea965c2ba9c9dcaaee9d59a
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361