Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b13dd8d9b1c4f23…

MALICIOUS

PDF

74.9 KB Created: 2021-03-02 11:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2fc06bc15ac676360d29fce316b5e40b SHA-1: 438ccec0c1b018f874b4d001111d13118800aed2 SHA-256: 0b13dd8d9b1c4f2312617c60dc9607ad0f786d4e754fac7a1a922bea48021f26
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains text related to '3D animation for beginners', suggesting a lure to disguise the malicious nature of the links.

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://jottigo.ru/strik?utm_term=how+to+3d+animate+for+beginners PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/kunowiwegax.pdfIn PDF document text
    • http://trylait.club/64074256704k9o4g.pdfIn PDF document text
    • http://barefegek.iblogger.org/73424281933.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/10410444534.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/5ifN6ZK/75385339302.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/lSjjjfs/14385919608.pdfIn PDF document text
    • http://timinome.getenjoyment.net/58321407655.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/how_do_i_connect_my_cricut_crv001_to_my_computer.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/la_la_land_lyrics_green_velvet.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/22283433703.pdfIn PDF document text
    • http://jevopapivixepe.iblogger.org/happy_chocolate_day_video_song.pdfIn PDF document text
    • http://vivadoctor.ru/crossfire_series_book_3_onlinemjie7.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/turabezawukakubeku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebusatoro.atwebpages.com/engineering_mathematics_ka_stroud_5th_edition.pdfIn PDF document text
    • http://linopiziv.epizy.com/wivirevunegokejavuluxa.pdfIn PDF document text
    • http://tokozod.myartsonline.com/book_of_occasional_services_pcusa.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_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 5552 bytes
SHA-256: f53ab13bad24a4ad3e81b54490237b50f8803c38ae82316d2bf20a97ae380648
font_01_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 10068 bytes
SHA-256: f39f30046f7646050a870df42697bc6a4fa654cdcb4f438061723ba5f97f8f13

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