Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f648e1bb14b166…

MALICIOUS

PDF

73.4 KB Created: 2021-03-05 12:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c903d2448479c12d4056b3fe6b56c23 SHA-1: 9adf8be5a584ab7b0e8260e369464469a050a025 SHA-256: 66f648e1bb14b1660f1aaeb550b560149b3343b253a1a6298226493b64501cf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9960

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://resalured.ru/award?keyword=watts+premier+ro-pure+replacement+faucet PDF link annotation
    • http://sugameloxufe.mywebcommunity.org/favito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_603ef041ebce8.pdfIn PDF document text
    • http://sukalobuvigaz.22web.org/tedusiwekegetemor.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/iiJ0Thd/basketball_recruiting_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/ggf0IRp/boxovevukelarino.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/33725269658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6013ea52b7567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600dbdb431149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_5fe9a887d51fc.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/jcVjfid/top_100_country_music_videos_2019.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/49415312675.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/jjiiK4r/88278996885.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/hh5PFih/zozumulaxojibidelamoxagek.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/54048318413.pdfIn PDF document text
    • http://vanesifonemume.22web.org/17679375373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nodefojabotozij.rf.gd/essential_physiology_textbook.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/1597602353.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_3376ad4eaea94f19b9012895e5ebd90d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d548055-c440-4db3-8370-47112c4a7dc6/dolores_cannon_books_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2f08d6-b318-4779-8acd-1166e4442166/10947516159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc588fb1-8f3e-4288-8a63-a7187b1f1d1c/11736341848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e966ab-f671-4559-b902-95c0977e85ea/tc-99m_maa_liver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f45723a-fd11-4f1e-8723-7d8be58b6802/jewedukusavijaruval.pdfIn PDF document text
    • http://nusorilafezevi.rf.gd/tinitobagixanudoto.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_f0c4c9e304694441a3a5dadf3b5cb397.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_0dfded91222c49a295fb6d8fa2f501e0.pdf?index=trueIn 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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 5204 bytes
SHA-256: 65ff639f3e69c05651fe17d7f4054f144dc2b2244bb79d6e445d124e0b11586a
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10184 bytes
SHA-256: 5eb72bd856be7650758faedc18772bebbac18674aa87737914e543dac041370e