Malicious PDF — malware analysis report

Static analysis result for SHA-256 f776d140d386b1de…

MALICIOUS

PDF

68.6 KB Created: 2021-03-21 10:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 369c3d999d56a0982165061636d4b465 SHA-1: cb1596454fc352e141b5bd15c1fcf2122dd2dfe5 SHA-256: f776d140d386b1de9da05e2644a7894ad85b97ea37497cac48357ded13f1adbd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the structure suggest it's designed to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=absite+review+practice+questions+pdf PDF link annotation
    • https://mejoraxu.weebly.com/uploads/1/3/1/3/131380998/f2cb2b.pdfIn PDF document text
    • http://justiciaforjustice.com/30442783463ptgat.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/5846513437.pdfIn PDF document text
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/6a2ff7e6f12.pdfIn PDF document text
    • http://yachts-4-sale.com/website_that_answers_math_problems_by_taking_a_picturech6wv.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/nitele-sifeduzaj.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/how_do_you_service_a_husqvarna_sewing_machine.pdfIn PDF document text
    • http://genusttwsr.fun/40717941942jkob4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefuwaw.atwebpages.com/easy_piano_songs_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301045e0-cd22-4d87-8fe3-48cb40fbabc6/is_vizio_model_e320-b2_a_smart_tv.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/mutovisotitofinukamomiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e568f7-bde4-42d1-abc0-5003c0cae3b5/car_air_conditioning_leak_repair_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20513c5e-ff4a-4a94-8835-58e05d929e4a/what_is_the_best_gift_for_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58bbc64-81d6-4e81-b852-dd42fa18098b/vishnu_sahastranaam_path_hindi_mai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673b549d-6467-4d70-abc4-8d7b65942148/mizejizojuviwopujofid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3149c6-4686-4d47-b57a-b07542d80941/taxoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47915202-2787-4c0c-b22f-59a7ae1228f7/is_fifty_shades_darker_on_netflix_canada.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_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 5524 bytes
SHA-256: d481f2beb3e0faf6939d469fcd7dbadb650939181a77469e7f24a079a559530d
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 10568 bytes
SHA-256: 043b5720d96762934b7f526dc80c2d0329e360f2eaa30a450dd58372c9abf5ec