Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf2a592d9e786b2…

MALICIOUS

PDF

72.5 KB Created: 2021-02-06 03:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a0d59f8e4c20920d415d03cfc93d5bb5 SHA-1: d43742886b5b4fb5a38536717d44d2ab1bfffa34 SHA-256: 8bf2a592d9e786b2e69591ced6c6df100124b89d7f8f2ee7e587fdbf06f2a395
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution campaign. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/aws?utm_term=guide+book+of+social+science+class+9 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5fed92899a586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5ff5747aa879a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_60195288d659e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fe7b4ae3fb5a.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/ejaHjjf/magic_piano_mod_apk_2._9._1.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/hOfjehh/how_to_raise_a_child_with_adhd.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/6959536.pdfIn PDF document text
    • http://girizug.22web.org/xejibaditajojigamafesox.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/fadopopexo.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Qgh7rid/sudosukesitoru.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/607723.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/Ljcmjag/battlehand_heroes_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5ff9c4d909d8b.pdfIn PDF document text
    • https://cdn.sqhk.co/nolugavetiri/ggjfeje/auto_clicker_app_download_ios.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/kali_linux_android_theme.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/911534.pdfIn PDF document text
    • http://sizegivip.22web.org/spectrum_tv_guide_dayton_ohio.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/bopuxosavubare/oneplus_forum_android_10.pdfIn PDF document text
    • http://walefusariwe.epizy.com/voxewigovoviburiwiv.pdfIn PDF document text
    • http://malinaliwul.epizy.com/6334421395.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/latest_browser_version_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/77524128831.pdfIn PDF document text
    • http://jaziwovapotulit.epizy.com/games_real_football_2012_apk.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/introducing_new_employee_email_template.pdfIn PDF document text
    • http://pebulibupa.rf.gd/free_dashboard_templates_html_css.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5308 bytes
SHA-256: 79028994457a956f2efd50b71efc5634aa7a197b067ea0ebb0340a466609a5e4
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 10208 bytes
SHA-256: 7bcb585f4b3d57d9df029cb21ba0e154214e76475088c0ec78b975c7c0739aae

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