Malicious PDF — malware analysis report

Static analysis result for SHA-256 35030e2d0e10ca37…

MALICIOUS

PDF

68.3 KB Created: 2020-11-11 22:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bf3502668f731bdd40726f06e71ff459 SHA-1: 1bd8937673d65f7685137cbdaf8a452e2e15021d SHA-256: 35030e2d0e10ca378bcea9da299008e551433b7942e47e1ddbcfde8a3be79455
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=leukemia+case+report'. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of embedded URLs and the redirector link strongly indicate an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/aws?utm_term=leukemia+case+report In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_5f9539d53e0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f97faa08a496.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/lumixi/punctuation_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/4940552869.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/45010702305.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/29439963245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc3e1aa-4904-4d29-a47e-f56918820394/fl_studio_8_demo_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/ripley_middle_school_website.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/earring_template_leather_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303d8f78-d852-41a1-9fc9-c25d27fcfbe3/8221772114.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/almendras_beneficios.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/ritazofubuwibe.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/billy_madison_number_one_song.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_off0000d1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 5052 bytes
SHA-256: f754632d8b1b9c10a26042f8ebdcf5ee5857c17923c2749820092dbcc219ad98
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 9808 bytes
SHA-256: 886ce2f1512e28baf754691345c22a2be2b1cbcfb91f536c76a4ab46485103a7

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