Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c0815c7846f669…

MALICIOUS

PDF

82.5 KB Created: 2021-02-16 01:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab3589a99af8f6da1a943dec38ba36d7 SHA-1: ee852915929687fa0e4dc11f853f1a8025a27d6e SHA-256: a0c0815c7846f669989318ed1d84c8f6b9fdefb0de3c3cb5ea1cb8adf8839dee
66 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 pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of many external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=que+es+primeros+auxilios+basicos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486200/normal_600def00a38f6.pdfIn PDF document text
    • http://usacreditcheck.info/vba_word_search_and_replace_stringrws3l.pdfIn PDF document text
    • http://blognews.top/k_c_college_full_formlt1rs.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/YG0jcif/holy_roman_empire_historical_definition.pdfIn PDF document text
    • http://matroskin.space/flight_sim_2018_mod_apk_rexdlpohsq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_600c83b55f8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fd16183554a2.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/f312452023b9.pdfIn PDF document text
    • http://tuimag.ru/594957883c30vq.pdfIn PDF document text
    • http://uorott.com/zejurldbue.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/bkzqiiZ/spider_solitaire_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/jbf0hj4/zukademameg.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/UQgcvja/61303847327.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/remezu-ruwanezobapapif-vejafu-konajakibeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406516/normal_5fed979ea1ea5.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/bejikefowu/electric_vehicle_in_india_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/7048125322.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/fobowuxuzavugasare.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/derubar.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_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 5348 bytes
SHA-256: ace00ecf7a16b2909905193c78ef0ed0654072e964db6a8f3e69a512650c35da
font_01_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 11700 bytes
SHA-256: 5559d6a8b9eb9174364047727555fc896ec7a861d7451fa524711937c3aed01d

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