Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb1c65392da09bf…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 21:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 588de5e58f4cdf08320330b751a7ef57 SHA-1: d9a78af1d247d4e5de3a21811214fc1f859288cc SHA-256: 8cb1c65392da09bf435994e969da9c889370fcbccc7c4eb57f119ab75c6ebfe5
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs, such as 'https://jottigo.ru/strik?utm_term=autocad+360+free+download+for+mac', suggest a phishing or malware distribution lure, likely attempting to trick users into downloading software. The presence of numerous external links on disposable hosting further supports this assessment.

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 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=autocad+360+free+download+for+mac PDF link annotation
    • https://cdn.sqhk.co/disumuneriva/6QijiaM/rusofavibevekiniwavetibab.pdfIn PDF document text
    • https://fugakesuj.weebly.com/uploads/1/3/0/7/130776648/7a3c28b2.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/jagePha/11138951076.pdfIn PDF document text
    • http://karnaval.host/fritjof_capra_web_of_lifem6y2h.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/1771653.pdfIn PDF document text
    • http://diseguj.22web.org/online_convert_jpg_to_200kb.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/sorub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesefapor.epizy.com/83149061370.pdfIn PDF document text
    • http://xidozex.epizy.com/annotating_a_poem_worksheet.pdfIn PDF document text
    • http://xijopugoluf.rf.gd/63673125660.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/breathable_sheets_target.pdfIn PDF document text
    • http://muwalolerede.epizy.com/hipoglucemiantes_orales_2019.pdfIn PDF document text
    • http://linanimeb.rf.gd/consultant_billing_invoice_template_excel.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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 5528 bytes
SHA-256: 7c30ff8f006563b539b7efe66006cee03ba7c6e1fa1db13b2007489f820068ba
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 11096 bytes
SHA-256: 1a22bd737b0bf91e5f03883b6295bf1d27e1e56ae91050f8601c1538d3721b51

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