Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6a1456a98a8c92…

MALICIOUS

PDF

72.8 KB Created: 2021-03-20 11:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ecc3ab57c04f12b798bfecf9bf2e29b6 SHA-1: e1b845ca9ccdce95b67737b148c748e257ec746f SHA-256: df6a1456a98a8c92c943d1ac3fc16549fd55228dc8a4dd95cd838348361353ee
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. A key heuristic indicates it's a social-engineering lure, instructing the user to install a browser extension or update to view content. This suggests an attempt to trick the user into compromising their system or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ponafet.ru/123?utm_term=grammarly+free++filehippo PDF link annotation
    • https://cdn.sqhk.co/gowamojon/63WKjak/18001793834.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/guguzimoso.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ijifTha/best_deals_on_laptops_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/L4hghia/37461581855.pdfIn PDF document text
    • https://cdn.sqhk.co/salaseli/CZic6jg/electricity_plasma_live_wallpaper_pro_apk.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/bryant_model_350mav_parts_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/hgdCIji/adidas_outlet_online.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/cf8bca3d-a6df-453d-b741-e6ba2e776a13/what_is_brayton_cycle.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_20628fbf28094fd4ba60167aa7485efb.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_f6b1d5d595514797b0594b2c1a72a260.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ed0470-d185-405b-8041-2b8421455068/27593257324.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/gopro_hero4_silver_software_upgrade.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_c014a231e3f34f5094fe5f28ce900375.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/71597691408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa029f7-6d6d-434b-a076-8d6aaf6ddc5e/mevizowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b08aac-78a7-4a20-9fbd-f80af4161049/porter-cable_compressor_kit_home_depot.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_f49f8c08a4aa49ab96c936cf013dc498.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc1a6c1-3059-4d53-b56b-1384544212e5/gafoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae05a84-187a-4cc9-8bf0-d6b9c3b8d032/whirlpool_whes33_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff999e15-ec56-41a8-bf9b-ba02bd446a33/how_much_does_tracker_cost_per_month.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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 5096 bytes
SHA-256: 8af35a34382c5857120d51462d3986cd38cec5666935378dec901d9fb6cba767
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10956 bytes
SHA-256: 685fb03b467af33026899b8a18df8a0f3c8a73dfcd82b785f9327593ac0ace5a