Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe0dcec34188fa2…

MALICIOUS

PDF

80.5 KB Created: 2021-04-08 08:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e77004f80b03c324c4b33e7111ce8101 SHA-1: fc382f5708b2864e8e6fc000a044a3cb748eb525 SHA-256: 3fe0dcec34188fa29a72856e25f8193384ee47c13a42c00d18956dbdd502cf50
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=do+mutual+funds+have+symbols PDF link annotation
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/612412.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/16a4204c6f88b6.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/convert_ft3_to_m3_s.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/lojalowaweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_60261211c0fd5.pdfIn PDF document text
    • http://vkrowl.com/intermatic_ej600_wiring_diagramr28ae.pdfIn PDF document text
    • http://citimart.online/2540267576109b7r.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/divine_mercy_chaplet_in_song_ewtn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_5fe63cc2e3b03.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/pathoma_2019_vs_20205wf1o.pdfIn PDF document text
    • http://vir-tus.com/old_adventure_games_pch5dkp.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/6597815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_5fd2726881670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6020706571c01.pdfIn PDF document text
    • http://bcipreactivaperu.com/bifamaletipefisono8.pdfIn PDF document text
    • http://save50.pro/which_part_of_canada_is_less_coldfotq5.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/bukuvenanijotirilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_6065db8cb0df1.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
    • http://wadoromutisagar.myartsonline.com/business_analytics_program_salary.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_2024d9b545744f9d8ce47bfc5e3e1fda.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_cb25b52587ab4335b1fa0de5d1b30a39.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/baldur_s_gate_descent_into_avernus_online.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_27241b4dc165482f982d0e69859e47f1.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_f749971a60aa4509b422112cd835820e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5188 bytes
SHA-256: f7b310f8b39d4e5e005183a382fe56213a125a5cc8aa79b621176f6ffa3153fe
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10824 bytes
SHA-256: a4fad5fb9da8a5286ff433133a1a596917fb95d717e0c291715bcb21bc831578
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2