Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f089a2b3a1e298…

MALICIOUS

PDF

73.0 KB Created: 2021-03-11 22:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 970de7a762dbf5b90db3cd0f3a215d5d SHA-1: f55e7e9b9c18b2cbbf7f47be6d5b56203f73dc69 SHA-256: a1f089a2b3a1e2984cae5057d99eee7d07c46a771c324a06fe3c3c0fa9577401
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/award?keyword=el+abc+del+aprendizaje+cooperativo+pdf PDF link annotation
    • http://myfoxing.online/diluzexu4wh2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_6043b3d4cec5c.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/how_to_add_songs_to_eclipse_mp3_player.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/algorithmic_trading__quantitative_analysis_using_python_udemy.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/cells_and_batteries_chargeable_and_non_chargeable.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/java_gui_components.pdfIn PDF document text
    • http://myimperfectmomlife.com/btw_aangifte_nieuwbouw_formulier_106bzgq7.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/listening_task_for_grade_10pu8ek.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/Pgiggij/75283101941.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/gdjhiiy/62085178357.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/twisted_tea_raspberry_ingredientsx1uyv.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/occupational_respiratory_diseases.pdfIn PDF document text
    • http://mynasert.online/70473245847x1uaj.pdfIn PDF document text
    • http://soldonlittleton.com/zawijofuffhnq.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/george_foreman_digital_family_size_smokeless_grill_grd6090b.pdfIn PDF document text
    • http://newsportstechnology.ru/nitoresexigumogo1ob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5feb7664cd128.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/best_free_guitar_lessons_online_reddit.pdfIn PDF document text
    • http://creamwalls.online/13363039053594ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_5fd615fb4c581.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/78774490105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_6008181bba641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_602a9be069a18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifojizu.myartsonline.com/perimeter_word_problems_worksheets_4th_grade.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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 5252 bytes
SHA-256: d1fd5377bfc704be6be160647c184ee964383a5c488332258b5f2679cb330f9a
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 11368 bytes
SHA-256: 24c8cdff5556ce676b7443cb183d9e25eab98eb5205b03dfa1a8c26ab5034e2f

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