Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd5ba90e4d5cc7d…

MALICIOUS

PDF

80.9 KB Created: 2021-02-25 14:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f440fe5a1983a3a2c4b0b521d1fa812 SHA-1: d8bd026d3fce7b06278218a17abe8d8102aa503f SHA-256: 0bd5ba90e4d5cc7d8e594cca5283123f838bcfd0f86efb3f1975335295f16cf3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or redirection attack.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=planet+bike+proteg%25C3%25A9+9.0+computer PDF link annotation
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/tururowovuniwuj.pdfIn PDF document text
    • https://gasilarax.weebly.com/uploads/1/3/4/5/134595303/nisuza.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/pre_algebra_with_pizzazz_double_crosksqcw.pdfIn PDF document text
    • http://digitaloffice24.ru/what_is_the_authors_message_in_the_bluest_eyeaijzr.pdfIn PDF document text
    • http://wilozobugo.iblogger.org/best_simple_tower_defense_android.pdfIn PDF document text
    • https://subuletow.weebly.com/uploads/1/3/4/2/134265429/dazof.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/80275125870.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/kowopudafili-sizokurorex-sajakusudejez-tewasiwegu.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/rubibudujakuwujepife.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/vuzopetobuvibide.pdfIn PDF document text
    • http://copyrights-notices-helps.com/vudifinubevifibakivinetobboxri.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/1.garmin_nuvi_2597lmt_vehicle_gps.pdfIn PDF document text
    • http://pixxel.life/nasagitinevatojipisulajohgqu3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/56960400729.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/colourful_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/the_landlady_vocabulary_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/conditional_probability_worksheet_answer_key.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_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 5752 bytes
SHA-256: d1f941c24344749c667d48da10c5f8eff0b8913be0e9dbfdf0fe142f8283ccbc
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10984 bytes
SHA-256: da0a35d2b979e9beea5f840a0660207ac2a4e75f0d5e3f5b2580ede21cff6c55

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