Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb54d3529dfed902…

MALICIOUS

PDF

78.6 KB Created: 2021-05-09 00:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a14767df5ae481a23c4755232d5aee73 SHA-1: cdb5417459d8ee068ce318a46fa227e33c30433d SHA-256: fb54d3529dfed90264481666db1637f960a465d02454178380474257e520984d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

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://jumiwimov.ru/strik?utm_term=gurps+4th+edition+bestiary PDF link annotation
    • http://koprovk.xyz/45611992383mh7sm.pdfIn PDF document text
    • http://organic100.fun/descargar_reproductor_vlc_para_tablet_androidbo0at.pdfIn PDF document text
    • http://wugedasogulal.iblogger.org/diagrama_de_caso_de_uso_ejemplos_resueltos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fcad98d09ccd.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/ggTe4jb/deck_heroes_legacy_mod_apk_wendgames.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_601e3b2df163c.pdfIn PDF document text
    • http://bluebadgeform.com/formas_de_comunicacion_oral_en_los_pueblos_de_guatemalaumq7w.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/uhek9ic/xafupufowenutodijipolive.pdfIn PDF document text
    • http://groby-ritual.online/poxej57kws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fe8610fa6140.pdfIn PDF document text
    • http://alphabitx.com/vulizelowarojujidupinobx58al.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/Lgijeyu/running_man_quiz_level_16.pdfIn PDF document text
    • http://instapodarok.site/pevoniwejetufepezawebzj2g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledegov.epizy.com/29433956850.pdfIn PDF document text
    • http://jomedive.epizy.com/english_grammar_practice_exercises_with_answers.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/tratamiento_de_alveolitis_humeda.pdfIn PDF document text
    • http://mojipanitupawo.rf.gd/the_vampire_diaries_season_8_episode_11_watch_online_free.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/novikoju.pdfIn PDF document text
    • http://tuvaditeli.rf.gd/andaman_and_nicobar_islands_travel_guide.pdfIn PDF document text
    • http://degeluvugo.rf.gd/wumopu.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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 5376 bytes
SHA-256: c03d7b13b3d0f560276c70d5a298d5817b77c018084860a46df58e09aebed427
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 11548 bytes
SHA-256: 1db5cc2ffbfd146985dabe575e7137f1d954e0eea72ae62139f1b4a376c98d71

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