Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77040b6f4ad4ede…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 06:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8afb82e09cc4df1a24f24e55b1a4c694 SHA-1: 3a1ecbe854f8c7b94c0aef2725e1dd1f503fc8fe SHA-256: b77040b6f4ad4ede2e2c097aee49453ecadc0a09d367982ae67aef4431262447
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'maypoin.ru/award', suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used for link farming on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=tyranny+of+the+urgent+poem PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5fcb1d341242e.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/Oigc7IW/planet_fitness_cancel_letter_template.pdfIn PDF document text
    • http://bigno.space/free_powerpoint_templates_for_school_teachers6o23p.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/sikifaruzoxekojegudobomo.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/what_time_does_the_stock_market_open_my_time.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/njh7rhd/weed_strain_app_iphone.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/sewetipakadevosibumategi.pdfIn PDF document text
    • http://pribor-poverka.site/picsart_latest_mod_apk_revdljvlzw.pdfIn PDF document text
    • http://znatural.space/27580488321oofhs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifusikiwo.epizy.com/what_is_the_integral_of_cosec_x.pdfIn PDF document text
    • http://finabupotokuko.epizy.com/93023193863.pdfIn PDF document text
    • http://sasinazubusun.epizy.com/nozegejojexebanav.pdfIn PDF document text
    • http://wumekupewug.rf.gd/manual_del_corredor_publico_inmobiliario.pdfIn PDF document text
    • http://novozozoto.epizy.com/ruxodumijedupexasil.pdfIn PDF document text
    • http://rubirabe.rf.gd/fejimowama.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5156 bytes
SHA-256: f060f6737ad5a6b6c3193eaa65d841a6df9696a3887ca5023e3c3ce6bd3937e6
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10692 bytes
SHA-256: 0481a98140e9e17a2856225055effa6f3a8a20be97b032944f0ea40a95317db9

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