Malicious PDF — malware analysis report

Static analysis result for SHA-256 527cb2d3c2415e32…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 02:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 16d84e0071a619812907632b099a18dc SHA-1: 1e862ded7e7ecc5695e983f9f2cb37b2ba3090a7 SHA-256: 527cb2d3c2415e32ea3a3623572285c7f1ca3ee1790d00eca1d19508f869ebae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=guide+to+critiquing+a+research+paper PDF link annotation
    • http://masito.space/email_template_for_launching_a_new_product8eeto.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/jijpgia/love_heart_live_wallpaper_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_602ae7878f448.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/jeicjc9/repinapil.pdfIn PDF document text
    • https://tisemijosugimuv.weebly.com/uploads/1/3/1/0/131070246/749998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5ffa4dbab34fa.pdfIn PDF document text
    • http://select-get.top/89842590572muuly.pdfIn PDF document text
    • https://salovunuwav.weebly.com/uploads/1/3/0/9/130969923/5347092.pdfIn PDF document text
    • http://agent-spv.space/242923217946xoxw.pdfIn PDF document text
    • http://medway24.com/always_on_display_huawei_apkclfih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_604fe5025da1a.pdfIn PDF document text
    • http://lessonsonline.site/zemijojovopaoqg6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_600c8c3cf0cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_6059a523656bc.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/7009817066.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/core_java_interview_programs_for_experienced.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/nexotuxebakiratogatotij.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/garorowa/navien_npe-240a_maintenance_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/demubivapil.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/teacher_s_guide_english_10_unit_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/37290036396.pdfIn PDF document text
    • http://mojozore.myartsonline.com/how_many_days_a_week_is_bbg_workout.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5460 bytes
SHA-256: 5b82ad45bb2a744ca4c77b14273b17dee6799019f04eca134a6df06fdb6efc34
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 10448 bytes
SHA-256: 200a9e4cfe32628ea47aad25c3b7a1b973a6dda52d6980135918000bd2e416e6

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