Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6206c1cfbf6bb4…

MALICIOUS

PDF

74.8 KB Created: 2021-03-15 05:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ceb7a7581725ee97ee14a03b263947da SHA-1: ba9dce0cda4b7a749b2e9da9445328aafe1c8b37 SHA-256: 7f6206c1cfbf6bb4cf6007517dda013ec89a877e0572a6d709ec3b79db42dd4a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/123?utm_term=autumn+leaves+partitura+viol%25C3%25A3o+pdf PDF link annotation
    • http://susurrus.space/los_juegos_de_ps4_seran_compatibles_con_ps564k45.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/iLyhjif/walmart_inventory_management.pdfIn PDF document text
    • http://dmgameplan.com/zenofuvapamidk62c.pdfIn PDF document text
    • http://ersoil.fun/3694771667799hft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490757/normal_5fee83789a57e.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/cQheIjc/bomb_manual_version_1_pl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_602174e052380.pdfIn PDF document text
    • http://hamsterbig.com/capacitor_104k_250v_datasheetxkynf.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/jaruwerapuwitewemiwazpp0jx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407988/normal_5ff3000cbf395.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/ffl7sUS/descargar_standoff_multiplayer_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/XghYTjb/hamster_collection_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/fjjHBKU/67316962953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_604424de2bf6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459483/normal_5fde1cb67d5e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_6bd3ea8cf35643dbaa2c35e038b36126.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb5f175-bfd1-48e9-b517-4f68c3f1c79c/wanetarazugebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c5fd67-e063-41d3-85be-bb21f747f9ec/pencil_sketch_portrait_tutorial.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_f30b6d3573ae44c786509c0fee396818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1967a9-9592-4473-b454-45365dce481e/arti_asmaul_husna_maha_melihat_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4b5b50-fdea-4a4d-b608-c03ca17200d3/706790158.pdfIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_f77c0b93f90b4400be241ea25be2f590.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/763d143c-6eee-4860-b528-e73a01ba6fed/puxodovijiwosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c035e41f-f0d5-4ed0-a8b2-d6543548dba8/how_to_delete_videos_from_ipod_nano_7th_generation.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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 5556 bytes
SHA-256: 83fc720dfd4777c99041cceae0030bd2303e88ba1e9f87882013502c36d41e60
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 11824 bytes
SHA-256: 8386689f2d33f2ddab7150a92069bacfcbc26e05027147851c6540aa75a20906