Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb36befb1a9fe37e…

MALICIOUS

PDF

74.3 KB Created: 2021-02-16 12:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b6a46b7fa563295f87a590576c539df5 SHA-1: 2b10003b1b542bb5a82fab1714c0254101bb2508 SHA-256: eb36befb1a9fe37e667a046f987b8ad541f1764ec56ebbb0a7dd318513610ada
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to 'electric fence charger for goats', likely a pretext to drive traffic to malicious sites.

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=what+is+the+best+electric+fence+charger+for+goats PDF link annotation
    • https://cdn.sqhk.co/tevunufoba/qidjijb/46142908432.pdfIn PDF document text
    • http://drovazvenigorod.ru/53123860724kt4cs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_600e3b77761ee.pdfIn PDF document text
    • http://topmassage.net/629821852117ou3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_600a9d5fa3408.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/jbKIqhf/72351354500.pdfIn PDF document text
    • http://ndfnasg.xyz/663544420132s0hr.pdfIn PDF document text
    • http://reduslim-ufficialesito.site/294686753628a1yq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6011e4f84459d.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ejgjeBX/ma_in_political_science_and_international_relations_jnu.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/gcQQhfB/moto_rush_gt_gameplay.pdfIn PDF document text
    • http://stassikorskyi.com/minority_report_netflix_canadat7ax4.pdfIn PDF document text
    • http://nature-ital.space/bryophyte_journal020t8.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/legenapi/netflix_s_on_too_many_devices.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/citation_machine_apa_format_website.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/58080724839.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/97647086372.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/71425145102.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/gdb_breakpoint_template_function.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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 5296 bytes
SHA-256: ec7dd7da131087d6fa55dea8091e3cbb957941a8da555f72bd046de442ada0d6
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10136 bytes
SHA-256: c437e1724dc82811705aa6fd8318ffcf0ee58b5c478c8c80d042764771805fd6

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