Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0929bda36c2dc3…

MALICIOUS

PDF

71.0 KB Created: 2021-02-16 10:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8679a1f9d96bd0a32ebc393c551e5827 SHA-1: c7f09ea0f6e05e248cbff8b6cb1a5df24ae20251 SHA-256: bc0929bda36c2dc33409a5d8092dd626e432fd1924ba7f3fd049d8cdd759cff8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous embedded URLs that redirect to disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the 'SEO DISPOSABLE LINK FARM' heuristic further support the conclusion that this document is designed to drive traffic to potentially harmful websites.

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://leonvi.ru/wix?keyword=resident+evil+zero+hour+pdf+ita PDF link annotation
    • http://btsworld.org/agyaat_2_full_movie_freevdxz7.pdfIn PDF document text
    • http://kpupnov.pro/browser_update_button_crossword_cluewujnt.pdfIn PDF document text
    • http://rubka.space/467330795681u753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_60244727e04e4.pdfIn PDF document text
    • http://summer-italy.fun/dexar6i2y3.pdfIn PDF document text
    • http://odemebayisitrafik.com/nudozukameone.pdfIn PDF document text
    • http://7lessons.fun/house_cleaning_roster_template6pzq5.pdfIn PDF document text
    • http://mainsale.info/watch_captain_america_the_first_avenger_onlinec7gja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_6004f65523569.pdfIn PDF document text
    • http://kyponnik.online/printable_inspirational_quotes_black_and_whitecpv0d.pdfIn PDF document text
    • http://znasila.ru/the_walking_dead_october_1jn32p.pdfIn PDF document text
    • http://onesmall.space/airframe_and_powerplant_study_guideisrz3.pdfIn PDF document text
    • http://micrometer25bill.site/process_of_adipocere_formation5ti3g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384296/normal_5fc668524f591.pdfIn PDF document text
    • http://securityverifiedservices.com/skull_live_wallpaper_for_iphone_11t0y6t.pdfIn PDF document text
    • http://blog-millionaire.buzz/what_makes_you_not_a_buddhistz45j5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisugefeka.rf.gd/appendix_engineering_report.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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 5248 bytes
SHA-256: 7189d4118d30e72c4add67e2c903fbb348c9b0203fb707a239193bd06fd37e15
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 10364 bytes
SHA-256: 9bc230f9401586b29697ab42f2ec60f9dd6e5e2fe5adc0694b8685f6cffdc4ad

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