Malicious PDF — malware analysis report

Static analysis result for SHA-256 33169c9ed62906a9…

MALICIOUS

PDF

86.1 KB Created: 2021-02-08 10:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 914e92e9be86ba2ec2937814bb5e7a94 SHA-1: 7f8eafd788fe274539f9018291d874f2bf726972 SHA-256: 33169c9ed62906a9a438afac128c68b08f10c136980ba85e9ffa3abeabd1fee2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The document body, though heavily obfuscated, contains text suggesting it's masquerading as search results, further supporting the phishing lure attack pattern.

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://baarspo.ru/aws?utm_term=lord+shiva+songs++naa+songs PDF link annotation
    • http://barcaporirternet-interbank-pe.com/2700918682sb6gd.pdfIn PDF document text
    • http://numberoone.xyz/ragazzi_crib_assembly_manualvjra2.pdfIn PDF document text
    • http://about-igsupport.com/tattoo_machine_builder_the_bulldog_ftr867.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/2c1dc8103a.pdfIn PDF document text
    • http://itchia.space/el_libro_de_jade_descargar_grativn8bt.pdfIn PDF document text
    • http://pollsexpert.com/riptide_gp2_mod_game_download5jukc.pdfIn PDF document text
    • http://bigno.space/free_powerpoint_templates_for_school_teachers6o23p.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/icNGQW4/immigration_and_nationality_act_section_212_a_2.pdfIn PDF document text
    • http://knitfqph.site/fokuvolibuvisusegopisabub6z.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/xqYiajj/cheap_water_slide_rentals_miami.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/ejb0sid/arcade1up_pinball_pre-_order_gamestop.pdfIn PDF document text
    • http://gouliwer.online/83913273056j639v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/pigolo/google_sheet_to_excel_converter_online.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/sorofaxakarekabubuzovuli.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/wulobugefajuvazaxebo.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/13358218459.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/las_capitulaciones_de_zipaquira.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/samesamubololopepakowed.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/startup_company_beta_24.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 5056 bytes
SHA-256: efed281ffc97d62ffca05bceebf22f5dbd5e23d4da8f34c7efd6ab34a50636b7
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 4132 bytes
SHA-256: 936d0a9bb8a64a04f5f14ef3fdf7c80f6f63aad414cba959380824056a3e25ea
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 11648 bytes
SHA-256: 63f13501f6025cce0763e01b1b773a4e01467a35bdc719efaa06bf119bf70724

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