Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c20be5ad158504f…

MALICIOUS

PDF

69.6 KB Created: 2021-03-25 07:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 34ae69022876d8b3f2c961982b3107ea SHA-1: 39fa5090e74ac57c7247afb284f3c5e4f6381a94 SHA-256: 4c20be5ad158504f4fdbb7ea60c72b5cade30e8b6f7dccb89c8944fa49733a33
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically targeting 'appendicitis surgery pdf' and hosted on a domain flagged as a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to external, potentially malicious, content. No scripts were extracted, but the overall pattern points to a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://jottigo.ru/award?keyword=appendicitis+surgery+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fceb92fc4477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fea436117b4e.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/jwij6bU/33587831563.pdfIn PDF document text
    • http://legko.travel/tutorial_adobe_premiere_pro_cc_2020_bahasa_indonesias3j4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_601200db7265c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_604dc12769c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_60206a932c896.pdfIn PDF document text
    • http://namabal.scienceontheweb.net/44316230951.pdfIn PDF document text
    • http://ourfutures.space/new_king_james_version_bible_buy_online93mda.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/17388537040.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/gUrghvX/23384868539.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/reasonable_adjustment_letter_sample.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/scanned_to_word_ocr_online.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/120111958y83kr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fcd6069ca1e5.pdfIn PDF document text
    • https://cdn.sqhk.co/degawatoze/1ijhSjj/58179631335.pdfIn PDF document text
    • http://ergors.space/pioneer_vsx_1020_specs0l2ak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500199/normal_6028a6f21c510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_6030a3793c1a6.pdfIn PDF document text
    • http://nefritthebestthing.site/lopegubasumerujex3gmib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418575/normal_5fefe710743a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_604ab29624e9e.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/malawimizoden.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexofapu.myartsonline.com/ice_bin_sachivalay_clerk_book.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/english_synonyms_with_meaning.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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 5172 bytes
SHA-256: 5a43e42e0989326f5f44b036daf0e89acffc2c94743a1353b9e021f995eacc8d
font_01_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 10080 bytes
SHA-256: e32312a4f113cabb94ce496bbc58905ad1040d14c15fb241950f8f9f6d6e6eaf

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