Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff0da28595e574f…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 08:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 90b74507704658d9a8a549ac47d3e3ff SHA-1: 741a9ddc354da83b70efd2034d6b99bbbd3dba4f SHA-256: eff0da28595e574f29130a500beebebcf3f3a64c750b054370742e1b6f756c91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one suspicious URL pointing to a potential phishing or SEO manipulation site. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/pbw?utm_term=atom+to+mole+calculator PDF link annotation
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/66ce6cbac3dcdd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4448343/normal_60b6920a222ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_604d95674710f.pdfIn PDF document text
    • https://nigepopevoxi.weebly.com/uploads/1/3/4/8/134881291/1680064.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/suravezidise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_601715672f30d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_604cccf0ef7ab.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/vakaditox_lejaxivizar_kewezova_wopomuxosap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_60ba85b5321e7.pdfIn PDF document text
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/suvojujeva.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/3c0b733d-cd26-4767-b1f1-231680ca5fc9/40750626154.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/f/how_to_use_rowenta_xcel_steamer.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144546288/ncert_solutions_for_class_11_biology_free_download_in_hindi.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/38497933804.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144456813/electronics_principles_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b824e454-9a55-4b7d-ba49-19cb24216525/boxariparifotuge.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/fiche_fraction_cm1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9312029b-d1b5-4ca9-a8ed-e06520897ba4/a_thousand_splendid_suns_analysis_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f7535e-5934-4720-9844-8c14dc5ae2c3/why_do_smoke_detectors_go_off_then_stop.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/complete_book_of_baths_by_robert_laremy.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144553200/how_to_reset_samsung_galaxy_tab_3_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ea30c6-4594-413a-9ee4-040bc908a5a4/the_keto_guido_cookbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb94cfc6-8d85-48e8-9075-9c9efbbf4b8b/letawowenotewoxasufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec9037a-2905-418d-97a8-a3b5d217eb05/flo_pro_6.4_egr_delete_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be011753-aadc-406d-9d4a-b09de66f6a56/is_halo_fall_of_reach_canon.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144554115/ball_bricks_breaker_3_mod_apk.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/cch_xa_ti_khon_twitter_khi_b_nh_ch.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/mortal_kombat_x_johnny_cage_moves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033cfd49-8f2c-40bc-8064-c84a362fb7c6/mapa_zonas_de_riesgo_cdmx.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 4756 bytes
SHA-256: be52c5b40c37b17a0d08747c154fc98a066d86149cea908551779ce1a3f17a3b
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 11944 bytes
SHA-256: 3b26308b99e858cb7eb6c8c9b2cc4ef9ce09e3d2b90745856cc2580eacd5071d

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