Malicious PDF — malware analysis report

Static analysis result for SHA-256 95741d33d3822b07…

MALICIOUS

PDF

81.8 KB Created: 2021-02-25 05:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b6865460cc5abeb83ec3881c7210293a SHA-1: 23a78f5b913d30300c5365086e9435b1175d3d23 SHA-256: 95741d33d3822b07407eb00ffef3e0e4ab893af6fe22f0c482b931a189acaa60
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1553.005 Security Software Blocking

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to a potentially malicious domain (jottigo.ru), suggests a link farm or phishing attempt. The heuristic 'SE_SECURITY_BYPASS' indicates the document instructs users to disable security software, a common tactic for malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to exploit users into compromising their own security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=cyber+security+cheat+sheet PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/dguypE4/homemade_outdoor_ant_killer_spray.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5fe25c457856c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_600c0bb09d501.pdfIn PDF document text
    • https://cdn.sqhk.co/dazulegug/shhZgVr/search_quran_software.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/e003ce2c05fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454042/normal_5fccf62e587ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fcbe75a2d894.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/davawina/arjun_reddy_full_tamil_movie_isaimini.pdfIn PDF document text
    • http://feriwodopumumo.rf.gd/barnyard_ps2_iso_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/tulinojuzipa.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/rockstar_movie_1080p_khatrimaza.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/chino_hills_weather_report.pdfIn PDF document text
    • http://favilogas.rf.gd/thankful_answered_prayer_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/brahmani_mata_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/4_line_handwriting_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/46469415959.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_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 5004 bytes
SHA-256: f1dd71aa10da3f34a7b7379e2995869b1c634b394aa7c21cf0eb2430d40e2620
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10540 bytes
SHA-256: 86771a925281e9e77fb0a0dd04f70625fd8f531ba1beb024607fae0f7872a4b3

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