Malicious PDF — malware analysis report

Static analysis result for SHA-256 d422119f9d07eaa5…

MALICIOUS

PDF

86.1 KB Created: 2021-03-17 04:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 59cd0eeb244386fc08a8bec94a9d0a5f SHA-1: 2a3069ca285bad34d42b4a3c60d549e9a6c1955e SHA-256: d422119f9d07eaa54a6588652b55976abfbd20fb28bbf06d5e39ae27663afa87
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=manager+interview+questions+and+answers+pdf PDF link annotation
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/6601882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_60078bab9f13e.pdfIn PDF document text
    • https://jutewalezozapon.weebly.com/uploads/1/3/4/0/134016751/zosowupobogom_vepobe_mitudejupen_gaxevos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_60018e5fa1166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5ff4a7dcc461d.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/58239308281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463272/normal_6000211b122f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6049ee433d278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_6041b61fb033d.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/stock_character_in_the_way_of_the_world.pdfIn PDF document text
    • https://jemexegotida.weebly.com/uploads/1/3/4/4/134464186/3aa553e2942.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/rexogeguxosix/ccna_v6_chapter_9_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/2020_calendar_powerpoint_template_free.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/percy_jackson_and_the_olympians_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/fejuzoti.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/rafobijoxaxifuzefuf.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/teeter_hang_ups_inversion_table_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/crossover_cable_color_order.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/aura_sync_rgb_led.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/skills_analysis_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/xegusoni.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_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 5460 bytes
SHA-256: e6f5a00410815c7f1783bfa5a62435ac4edb663c0fdd3188e9ef7b5128486c47
font_01_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 10696 bytes
SHA-256: 65ede1ab8e020c667750a3871ad672f19f5a74ad4f646ab645877c9f68b56d3f

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