Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bbe0c3345d267e…

MALICIOUS

PDF

75.1 KB Created: 2021-02-12 08:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81ee490bc935a693515e042ac8f4335c SHA-1: 9115bee77976da7cbab207c12c0716f8218d9e9c SHA-256: 21bbe0c3345d267e997cbcc53070d0f349b18c524834367f377323c3cf266cc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to S3 buckets and CDNs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious 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://maypoin.ru/123?utm_term=vance+and+hines+fuelpak+modes PDF link annotation
    • https://cdn.sqhk.co/pudinivil/thcO0hf/dudaxabewola.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/gjhhcX6/who_is_the_blinking_man_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/jjvoggL/pbs_super_cats_episode_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/ojhxjbz/fabojoxiximoxogewodoru.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/4049079.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/kudefem/8297691948.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/it_essentials_chapter_2_exam_answers_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/interpreting_graphs_of_functions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/eliquis_medication_guide.pdfIn PDF document text
    • http://mejavifoxeb.rf.gd/saints_injuries_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/bepeto.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 5328 bytes
SHA-256: ec3206283ee17b36a4e9cce625485b6388a7af21bdfba4ec7678d903752788b2
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 10484 bytes
SHA-256: bc26ace3e94b6936733034cb390d4b8a71b7b87ffb7a275f1cc02156acb13d3d

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