Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40c24da68437bc2…

MALICIOUS

PDF

80.5 KB Created: 2021-03-03 17:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b603c1bdf8104295116999bf3087b3e3 SHA-1: 0248e25ee174e754adc056c74628f3de7bbc6082 SHA-256: e40c24da68437bc23c1448507dae0f5a87188d07c7ad5245a31e2e2be326c570
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URI points to 'https://kuzutuzo.ru/aws?utm_term=que+significa+espiritual', which is likely part of a malicious redirection chain. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/aws?utm_term=que+significa+espiritual PDF link annotation
    • https://cdn.sqhk.co/diwiporeb/JiahdXC/carvel_ice_cream_cakes_near_me.pdfIn PDF document text
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/cf8abec2d.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/newewojuwusuletixi.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/jfsGRcV/ez_loader_trailer_light_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hhikTjf/cod_apply_for_graduation.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/libabujasigubufugof.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ahcgija/translate_portuguese_to_spanish_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/7igCmPA/samsung_level_active_earbuds.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/sazomo/82799030148.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/define_reproduction_in_art.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/44754088281.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/ipl_2019_schedule_list.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/zufodenedupuxafafanapuza.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_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 5244 bytes
SHA-256: ef9ffab3492d617d7982f6c2902ea4f5bcec540cf8c209f75a2ec97fe4fa79d0
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 12548 bytes
SHA-256: bb0e15b05b69411e704422ea15174f3af14ef7974cf8030db9eb73810e2ec725

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