Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fd07ad65c75caa…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 20:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef478c54a4de969122d9468c2f958b49 SHA-1: 3d67965bcb5fb7e9ad630eefb2e87c88dcd47e3f SHA-256: a9fd07ad65c75caa4421777e21070ee7747d66400505b7ff7d3fec5d7ff3654f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/wb?keyword=yamaha%20rx-v667%20review', are designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=yamaha%20rx-v667%20review In PDF document text
    • https://cdn.sqhk.co/mezutorixo/lidVhic/word_connect_word_puzzle_game_download.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/list_of_american_army_ranks_in_order.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/jeXSjPH/liradafi.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/DKhfgfv/kemikatupegixexukak.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/jdgfje4/tusozapejoz.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/walmart_prescription_safety_glasses_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/fjbhaja/mujuzenaxigopesexakupoko.pdfIn PDF document text
    • http://jedufozares.22web.org/57145216735.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/Y2WZbif/cute_love_ringtones_for_boyfriend.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwumatenenuli.rf.gd/1320653048.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/bxactions_pro_apk_2019.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/lixupuvufutemupiki.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/capitalization_and_punctuation_quiz_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/pexedizumekaxasuralegur.pdfIn PDF document text
    • http://rusuxagek.rf.gd/gafiwibaxak.pdfIn PDF document text
    • http://pomigipasa.epizy.com/89545986044.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/dozujavavudinabudusuz.pdfIn PDF document text
    • http://womopemi.epizy.com/business_analysis_report_template_free.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/kobajavuta.pdfIn PDF document text
    • http://fokozagizek.rf.gd/jquery_ajax_file_web_api.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 5164 bytes
SHA-256: c1f50e15a0910c886741ef38b0a172d481b8011790e8e947532bcd9e0fdc19d2
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10616 bytes
SHA-256: 7ec429646fe240b8d7a69ef362b20cafe7507c245b30aab6f8a78a3f09668348

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