Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0526c4fd0c541a6…

MALICIOUS

PDF

83.1 KB Created: 2021-02-28 00:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fb5a21c434fe8b00fa75dc65daf831bf SHA-1: 6ebcf41f4514d569515928890d125effba2a890c SHA-256: e0526c4fd0c541a66aff767c6b49ec285637dad12b8c6bd745faead1d117e249
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to car seats, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/aws?utm_term=what+is+the+best+britax+convertible+car+seat PDF link annotation
    • http://koponegigat.medianewsonline.com/fluid_dynamics_game_development.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/thoughts_are_things_poem.pdfIn PDF document text
    • http://crawlmqyu.space/tokasifeboresobopife6ra4o.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/sobetabaj.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/goodnight_stories_for_rebel_girls_2.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/the_talented_tenth_web_dubois.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/honda_rebel_300_price_in_india_launch_date.pdfIn PDF document text
    • http://complerbnp.com/lekewiwimikavap95dqk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452608/normal_60016ad6381d9.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/fender_mustang_gtx100_modelling_combo_amp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawerudarasikow.myartsonline.com/fekidimufusoluseraku.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/65163224354.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/tipekenu.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/beethoven_sonata_14.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/theory_of_vibration_with_applications_5th_edition_ebook.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_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 5168 bytes
SHA-256: fa4ee302374c43d665c36672981843549c0e0bb66ffdee453bd41001d7b15788
font_01_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10868 bytes
SHA-256: 3b63fc0b092962a34aa39845af7860e59c53e3f26f8fe75e508aecb85be97832

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