Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b2058e8c51f103…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 17:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 36469e5426ba4913c927598ff3871fa4 SHA-1: b4a25c1bc7800f95cacca23c29b73c0d711e4e97 SHA-256: 28b2058e8c51f1030f2c766810cb55d14b1341a7e9b315f37326dcfd3cf68921
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one leading to a URL that appears to be a lure for downloading a grammar book. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the document's structure as a link farm on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=english+grammar+101+book+free+download PDF link annotation
    • http://tifoxikutawe.sportsontheweb.net/sopixipezafugogepuzaliv.pdfIn PDF document text
    • http://dijawobal.iblogger.org/wefijoziki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_603b98063d5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_6035f04865f23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425533/normal_5fffa3547de8b.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/parts_of_speech_jeopardy_game_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/vumenibafadikabezupe.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/xetavulubixib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be49bdc0-581a-40e6-95e9-05c9ea6d6b1a/cuanto_mide_un_terreno_de_300_metros_cuadrados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4969128-5292-4d4b-a674-e5ae0807187d/replacement_parts_for_insinkerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c22a3d5-d8e1-45c2-9311-cdf1e3fdf41a/how_to_find_maximum_normal_stress.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/vomujinewofel.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/divipugipizimememeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea51409-e4af-4251-814f-fb0efc0a42de/34610466748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f849c7-5459-4eab-af39-802fde4ff23e/maths_book_for_class_7_maharashtra_board.pdfIn PDF document text
    • http://xuwanozofugis.epizy.com/todas_as_aberturas_de_xadrez.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_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 5768 bytes
SHA-256: 69b35ad450246524f058526ca139c12d0eff7f770ad9bbd7c34a4ab64d1e9457
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 10624 bytes
SHA-256: 103e23d30bef73e4bc2fc01be4253ad2a18bf50d33e8fecf423179c15efd319b

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