Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4e9db820f76730…

MALICIOUS

PDF

66.9 KB Created: 2021-03-14 16:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31b97a8df0715595d90b9520b7abe280 SHA-1: b01802c95e00596f39db713e3955cfd71441700f SHA-256: fd4e9db820f7673084c19f6a02984f6180a99cb28b13938650ba22837050c1eb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with a link farm and potentially malicious content. The PDF's structure and the presence of external URIs suggest it's intended to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=wings+of+fire+book+2+audiobook+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450517/normal_603be4b359030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fceda97f17e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_603614a6487d8.pdfIn PDF document text
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/1666217.pdfIn PDF document text
    • https://gilivederediwo.weebly.com/uploads/1/3/4/6/134683856/5ae6c91c6e606d3.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/60779835149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_60197ca998afc.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/tatapula.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/xituvuzajemesu.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/motubadejovadikojonebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_6010a48c1ce27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5fcc21355431a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peledopa.myartsonline.com/1203227768.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_5e41d68e4bf14e908f12e4637f4fd147.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/952dd9d4-0d75-4537-a8dc-25e71850cb0d/gikegedefijigevake.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/netgear_wnr3500l_v2_default_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1430913c-9a3e-4a69-818b-a7fdc3c4ee36/dunkin_donuts_careers_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2ebd9c-5256-41a8-a384-6daf7f444494/tecnicas_e_instrumentos_de_recoleccion_de_datos_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b84c49-d803-4a6e-b6f9-4dc5ac6418c5/42434286351.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_63c32a3f995744eabfd975e178cd1d71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bc63fc-329f-49c8-9fa3-136384c6c517/ma_new_driving_license_rules_2019.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_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 5392 bytes
SHA-256: 24d7050d37bdb76a6365954be1c8d2d9c40db685172b0a9b15c4e291ce634913
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 9984 bytes
SHA-256: a2a658e2df9560698a79cb27176f3568724bbd20a1c11dfd111ab058fd72fa85

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