Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caab00af77303a6…

MALICIOUS

PDF

115.3 KB Created: 2021-02-25 18:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b2766240ff3fd89f64493cfb14f55302 SHA-1: befcd6ce7752c2c6b1d50c5b06cc998cebe9597c SHA-256: 1caab00af77303a64807184add1dbba8a89974e0b98617e50af8dc0bd8a0b884
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/strik?utm_term=problemas+porcentajes+6+primaria+pdf PDF link annotation
    • http://rufisurerupu.iblogger.org/prudential_life_insurance_term_life.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/nasb_macarthur_study_bible_2nd_edition_premium_goatskin_leather.pdfIn PDF document text
    • http://magic-world.site/38549836092r48z7.pdfIn PDF document text
    • http://proita.space/verb_tenses_mixed_exercisesidlx8.pdfIn PDF document text
    • http://esportzmlevent.com/5034794050890x16.pdfIn PDF document text
    • http://buyfastedcircle.xyz/why_is_my_vtech_cordless_phone_not_ringing9lt0q.pdfIn PDF document text
    • http://regsenatvumen.website/ringtone_2020_ke_ganaun5ck.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/fovilewa.pdfIn PDF document text
    • http://ru-en.xyz/389206852479fa5i.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/what_foods_to_avoid_for_coeliac_disease.pdfIn PDF document text
    • http://selectgetc.top/stickman_epic_race_3djtxfj.pdfIn PDF document text
    • http://blaugrana.ru/video_editor_apk_latest_versionswhij.pdfIn PDF document text
    • http://evatopshop.xyz/51300301690pytru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokakemipik.epizy.com/43524234096.pdfIn PDF document text
    • http://zokitidekav.epizy.com/ephesus_tour_guide.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/61303457495.pdfIn PDF document text
    • http://ruxatavebokoj.epizy.com/wawiwanozuf.pdfIn PDF document text
    • http://nofadokar.rf.gd/lesco_32_walk_behind_mower_parts_manual.pdfIn PDF document text
    • http://fitunugiwa.rf.gd/xaledeloli.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/how_to_setup_logitech_extreme_3d_pro_for_war_thunder.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E7 16504 bytes
SHA-256: 524d04fa0a7593a4f0ef3eb253531555c39495cfc033abe61dbdc47cc9fa9a81
font_01_sfnt_off00017b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B52 5672 bytes
SHA-256: e7ef62c9f0891d074a1688f561aa8c0d537fdcc4eb8b0bfe9c25b0ec2cc3dc77
font_02_sfnt_off00018e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E4A 1188 bytes
SHA-256: b1e5f9800cb2cfa1a7c1d87c06a40feff4465fbfc3111fb7934c2685f6bcf6f4
font_03_sfnt_off00019520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19520 12496 bytes
SHA-256: f9b1ee8175f0d090b544aa5ae9890fee5673de8294194ebab977e939bede2adf

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