Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec87d563ae84927f…

MALICIOUS

PDF

72.7 KB Created: 2021-02-17 00:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 643cd37f7897261c0289476e1f2214f6 SHA-1: 7618bf9edb2530427a19acd052cb16f43951232f SHA-256: ec87d563ae84927f8330ee9c7cfc5759c49dff4330cc15ce2ef34a277fd89970
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support the malicious verdict. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/strik?utm_term=how+to+collect+urine+drug+screen PDF link annotation
    • http://lazebusotidedof.22web.org/font_awesome_cheatsheet_4._6._3.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/8291603.pdfIn PDF document text
    • http://libralab.digital/simple_spreadsheet_templates_free6vonw.pdfIn PDF document text
    • http://coolmag.biz/312736279523fcqf.pdfIn PDF document text
    • https://naligunuded.weebly.com/uploads/1/3/4/4/134472871/mutozoxixadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_601d18ab3a896.pdfIn PDF document text
    • http://jewlgems.com/diamond_ring_shoppers_stopfayju.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/a0f6a7f2cc61264.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/temujonuwu/bowenpally_dagad_sai_anna_audio_song.pdfIn PDF document text
    • http://pejulok.epizy.com/67939919648.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/wow_alchemy_leveling_guide.pdfIn PDF document text
    • http://vevemaj.rf.gd/34625907940.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/bill_of_sale_invoice_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/if_conditional_clause_worksheet.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 4948 bytes
SHA-256: 97d0e2cb0108391aec1f0cc991d584a0d42523bc2be831c9f9f452413f5ac505
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10484 bytes
SHA-256: 06b4a2272958c01a0432df24510fcd75c31ad722d87708ac66c8e57b51e022f4

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