Malicious PDF — malware analysis report

Static analysis result for SHA-256 f971bd57b38ad6a1…

MALICIOUS

PDF

128.0 KB Created: 2021-03-20 04:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d2e703353539546724f8268ea39ef8c8 SHA-1: 23dc46cb8981aa8b8dbb927886fd2967d9126631 SHA-256: f971bd57b38ad6a1d5b49f492341869c8c6725aa52a2868679455d2e67884eb0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=who+dies+in+deathly+hallows+part+2 PDF link annotation
    • https://cdn.sqhk.co/jotenitix/hia6OsY/aptence_parent_connect.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/e4HgjHu/executive_summary_format_for_report.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/vubasoxurawamaw.pdfIn PDF document text
    • https://bezujaseda.weebly.com/uploads/1/3/1/4/131437953/liwopaniforivafe.pdfIn PDF document text
    • https://nuxogisufebodad.weebly.com/uploads/1/3/5/9/135965827/3077361.pdfIn PDF document text
    • https://cdn.sqhk.co/vifekodilevi/igThjUb/ski_safari_1_hack_apk.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
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_cf281276194044248387ffc05ad2c3b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/best_app_for_stock_market_news_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5a7a1c-c752-40d0-b0d2-1494118671cd/the_last_lecture_book_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a319f967-43de-44af-ba83-097895cd313a/how_to_make_shuttle_bat_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d110e73-fc7a-4e30-ae24-e457b0c762b6/sherwood_rx_4109_remote_control.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_282f509a33364754822c062734777bf7.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_6e6a217327d34d2291f04d593f7a56e7.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_77a7842c68fd4b27a26d9d1e6e499f5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6117ae-643e-4578-aad4-39986119df9e/68753728598.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/cardioversion_guidelines_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d2ae86-42f2-47eb-bf5e-e04ea987527a/49392486247.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_e4d8185f7d51465a9e0b1b6d3d47d247.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc85a781-d3c8-42cc-a1c6-58bd9c595f01/flir_tg165_price.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/neet_ug_2019_answer_key.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000194c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C7 5176 bytes
SHA-256: 567305ebe6fd8b3b81f4eff8914a42bcddfefe5034cae1c0a8b96bf9fbabb62d
font_01_sfnt_off0001a66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A66A 12532 bytes
SHA-256: f7f3258ecb5a589da11a7a952e9523825cb54c350fb3423373fe6dae88e9c7a4
font_02_sfnt_off0001cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFD9 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
font_03_sfnt_off0001e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4F1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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