Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c28d3512b462a80…

MALICIOUS

PDF

80.6 KB Created: 2021-03-03 10:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 33678f5b81167ba7f52ad34340c1c7a6 SHA-1: ee9675f43edcfb5f92d2125caa3c9368c931fef2 SHA-256: 6c28d3512b462a805082648f41204af4f37f511cc45f26c7866a3b768033c99b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content.

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://vilenefex.ru/123?utm_term=how+to+know+if+you+have+severe+acne PDF link annotation
    • https://fopabitibomasad.weebly.com/uploads/1/3/1/8/131857723/donobuligijutilefa.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/jadufavoxu.pdfIn PDF document text
    • http://desokore.medianewsonline.com/gidemapilosufezijuwena.pdfIn PDF document text
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/belavig.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/11048404998.pdfIn PDF document text
    • https://zavelodenewiguj.weebly.com/uploads/1/3/5/3/135314669/jalajenuzidod.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/92513407802frgh9.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/ghjdhec/crossing_the_border_into_canada_from_us.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/hjhiBXo/46213368479.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/5f785d5ee52.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hcigqhc/professional_photo_editor_app_download.pdfIn PDF document text
    • https://tikefukexizuse.weebly.com/uploads/1/3/4/8/134879623/rajibedewupopapus.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/0dGMhg2/51500701158.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/Yzidlhe/us_army_counter_stickman_rope_hero_mod_apk.pdfIn PDF document text
    • https://petovowatudero.weebly.com/uploads/1/3/1/6/131606592/tavonojubawinip-vatipu.pdfIn PDF document text
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/pebin.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/gimufesajo/bokizinusapojabejatopav.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/nebafewezufizepesawoma.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/proceso_de_administracin_de_medicamentos_por_va_intramuscular.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/temarokefovugexu.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_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 5216 bytes
SHA-256: 09c8995d0ff5aaa6916c38fd5f275cc6f875d087fba4117abc5967978259ba8d
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 11088 bytes
SHA-256: 62a95e36269e2daba0e6e0bd21c721118f983ba5026e2cd5385ab4a04aa6f1fa

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