Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c5166d9a85536f…

MALICIOUS

PDF

71.8 KB Created: 2021-02-20 14:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a79b25cc4e97d7fe3154ba11ad604671 SHA-1: e620a40829e2b7eeb19b1ffc418a1056774ce641 SHA-256: 40c5166d9a85536f17ccdc5fdfc66f8b839e554421c833c6e0866e3e7a770383
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a URL related to printer issues, suggesting a lure for phishing or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and the presence of external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=what+to+do+when+epson+printer+won%2527t+print PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fc9dbcb737cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fda58557fe91.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/U00gegc/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486775/normal_5fdb34c55b5f6.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/2884784.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/tiwubixunitoruzo.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/desekusoxi/report_inquiries_credit_karma.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/nova_stat_strip_glucometer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/how_to_sum_in_ms_access_report.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/arimidex_package_insert.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/diaphragm_breathing_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/30408458387.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/6304617260.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/consulting_proposal_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/12899780809.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/zutunizesuj.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/affidavit_of_support_for_form_i-_130.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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 5156 bytes
SHA-256: ada6cff64160888e4f158e69529f8d917b14618e76d1066615a01765e892400e
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10068 bytes
SHA-256: 79befd9c53cb88f8b7737b1ebd5163e323b27312c6e9a9bda71d019f519d1a2f

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