Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7766fe3b9364886…

MALICIOUS

PDF

107.6 KB Created: 2021-04-25 02:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59ac290c8f0924627d81fdacae0850fc SHA-1: 92bbec460d1e9675ef011d27c855597abec08848 SHA-256: e7766fe3b9364886c2e663852f096ea25c510e484a9e383c2aac2f8e8082ae52
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a URL with a 'utm_term' parameter further indicates a campaign-like structure. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=what+is+the+best+masterbuilt+electric+smoker
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/bf7ad51556.pdf
    • https://gijedilegin.weebly.com/uploads/1/3/1/3/131380969/refelipuwawe.pdf
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/5c8be60b6f94.pdf
    • https://falomomorojed.weebly.com/uploads/1/3/1/4/131438216/abf17.pdf
    • http://gejudoxe.mypressonline.com/11219907822.pdf
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5ff273b02a2af.pdf
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/woxovutebu_zawin.pdf
    • http://bumefivaloso.scienceontheweb.net/44506013679.pdf
    • https://cdn-cms.f-static.net/uploads/4479460/normal_601b2979ece12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xedawobu.atwebpages.com/84849379163.pdf
    • http://totefopige.atwebpages.com/duxalomamazuni.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/lil_wayne_duffle_bag_boy_remix.pdf
    • https://s3.amazonaws.com/tuxexi/sotimo.pdf
    • http://xawiwevivuzox.onlinewebshop.net/affairscloud_feb_2020.pdf
    • http://liroporuki.myartsonline.com/fodixonavijibim.pdf
    • https://s3.amazonaws.com/gofiguj/korean_embassy_application_form_philippines.pdf
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_feb87ffa889e4fbd916e188763ea0433.pdf?index=true
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_a439592039344a85ac80daad4c03dde2.pdf?index=true
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_41dd67d2960046d5b279bd10d9e01e2e.pdf?index=true
    • https://s3.amazonaws.com/nijudow/microsoft_spider_solitaire._exe.pdf
    • http://lawaxisagiwog.atwebpages.com/what_is_the_best_school_in_puerto_rico.pdf
    • http://sulijugofogim.onlinewebshop.net/62296977426.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_7c5079e6ec2e462c8009847fda230897.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016958.bin
df1577875908c564d98a7e6b36ed59043bbfafa066bf963577f4b5a99d338c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16958 5256 bytes
font_01_sfnt_off00017b1a.bin
7521765a615b547e9abc3b4ea31bf7974640c1009968a85f49011b60e708be4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1A 11064 bytes

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