Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44ee4dcd4e20551…

MALICIOUS

PDF

70.4 KB Created: 2021-02-16 19:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb73cb7950c7740cb6fdfe06d88b9a91 SHA-1: 2764ac3bbd3dc03554c71d13fff1090fde46c6d6 SHA-256: c44ee4dcd4e2055183551adedddd162e99197292c17bf261893f5cc3d123bc7a
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or SEO poisoning campaign. The heuristic 'SE_DOWNLOAD_BUTTON' indicates a visual lure to encourage clicks. The ML classifier strongly flags this PDF as malicious, and the presence of external URIs like 'https://leonvi.ru/wix?keyword=homicide+squad+hidden+crimes+cheat+codes' suggests an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=homicide+squad+hidden+crimes+cheat+codes PDF link annotation
    • http://lakulikelanu.iblogger.org/cancer_de_pancreas_tratamiento_nutricional.pdfIn PDF document text
    • http://gbo.guru/caballo_de_troya_3up4gb.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/zN2hgqM/claw_machine_places_near_me.pdfIn PDF document text
    • http://neuroncraft.online/sol_ayam_trke_dublaj_indir57wq5.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/ha9ibjd/lumonepamonedufaxufume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_6029c586a5cc1.pdfIn PDF document text
    • http://prizinsta.site/sotizoxefavetubemoslhua9.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/Zkhhial/ewanowski_christopher_d_md.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/1lTVshd/vawetujala.pdfIn PDF document text
    • http://formverifiedbadge.com/daily_astrology_app_android1qqno.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/f0Xhiy8/nyc_teachers_union_defund_police.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5fdeb0e3b161f.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/fewosav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5fee14ea5eb1b.pdfIn PDF document text
    • http://craftsmansmetics.com/bukettsnda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timavutiziv.epizy.com/endothermic_exothermic_worksheet.pdfIn PDF document text
    • http://jawikiluzejibe.epizy.com/handwriting_sheets_cursive_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/net_framework_4._0._319.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/pastor_ordination_certificate_template.pdfIn PDF document text
    • http://kabumosubeno.epizy.com/xapuwedezazes.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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 5236 bytes
SHA-256: f3efdd57568ec4335810da9b856df9d4aa6097a0d28f1cb0e3c0d61d4140eaf3
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10292 bytes
SHA-256: d58dc3d1569817fce583bda9b21ce48ba094f1b2a1931d2f09f20801f9aa3052

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