Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f93590d697bea5…

MALICIOUS

PDF

73.1 KB Created: 2021-02-12 02:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2ab1d9cd662839c13cfd9d2966ff5f6b SHA-1: 67b51cca36a26b9e50f305222342b29d5fa8c7e0 SHA-256: 35f93590d697bea5b011c271297c1e91a7a39d2733ceb704d1918c1cc7a9e2c8
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards an attempt to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=esperanza+rising+pdf+with+page+numbers PDF link annotation
    • http://noverst.xyz/41111274770e5duy.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/85728481578ruq3z.pdfIn PDF document text
    • https://jifedusibifep.weebly.com/uploads/1/3/0/8/130813848/larajamefefugu_zesini_nixov_wexisevoxebuvi.pdfIn PDF document text
    • http://verification-help.com/best_certificate_design_templates_freevz1z2.pdfIn PDF document text
    • http://show-visitor.xyz/manual_de_parts_motor_john_deere_404rcyci.pdfIn PDF document text
    • http://blognews.top/fraction_decimal_percent_conversionw7jk4.pdfIn PDF document text
    • http://mihetos.xyz/161469215332oj81.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/jinBejf/zig_zag_road_san_francisco_directions.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/3026075.pdfIn PDF document text
    • http://biomanua.website/7481958045328ibq.pdfIn PDF document text
    • http://getizibibi.22web.org/vocabulary_words_for_4th_graders.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/ibjijeF/41990096928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 5664 bytes
SHA-256: 4bed1afe58169b5df1320ed982fdaba9a8ab992f00e064967283e9f4db9a696f
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 10412 bytes
SHA-256: 8271224cd28033fb5c8f6b7204c765e72d99696f5791eaaa604c41f82b18cd20

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