Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a133f2534c4bfa7…

MALICIOUS

PDF

103.8 KB Created: 2021-04-30 06:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b333874c6ce414820665760de77af9c0 SHA-1: d5730576265b4763997972a6a499a09d18215831 SHA-256: 2a133f2534c4bfa7afe1dfcea5e5797fcb212a8e2625c4c05a574f0599c5924d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to direct users to various sites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern focused on redirecting users to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=course+outcomes+of+design+of+machine+elements PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407562/normal_5ff2e4df3de31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_60599c7dbd8fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_5fd34c8015157.pdfIn PDF document text
    • https://buresususotolo.weebly.com/uploads/1/3/2/7/132710635/susopupimiw.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/4ce15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_60438726b951e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fd0648ff10a7.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/ropuba/pusibumapopelitugosewopan.pdfIn PDF document text
    • http://kabumaja.rf.gd/ac_circuit_analysis_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/cheetah_film_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/xowodotibakake.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/apk_alight_motion_pro_2._6._8.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/98892120155.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/significado_de_la_palabra_tecnica_en_informatica.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/cisco_packet_tracer_crack_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/migration_certificate_format_free.pdfIn PDF document text
    • http://teruwizirazi.rf.gd/linear_voltage_regulator.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/lonevererezudenisuw.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_off00015a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9B 5340 bytes
SHA-256: 1175f0d20b4ed05db3266ca08824263e0c7c2eeb8d640bb44751e32462ae3607
font_01_sfnt_off00016c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C97 10792 bytes
SHA-256: 3dabc1ddb796be9524e8157a2f4cfb2fd46f054bbf7b7b7b960fee1a312c452a

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