Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f6c7147d28ae2d…

MALICIOUS

PDF

79.0 KB Created: 2021-02-21 21:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ee243d942a60b94d46f3bba34e41984 SHA-1: bff31740cc2a099137b2d78090eb1fbfe83ca4ec SHA-256: 13f6c7147d28ae2d798c8c34714a00bec4ea6e001dd0049615a20ede368a217d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or content distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

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=a+series+of+unfortunate+events+movie+2 PDF link annotation
    • https://wikivosunox.weebly.com/uploads/1/3/2/7/132741322/9864525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fc620e02525d.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/151f6c7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_601fd039d2682.pdfIn PDF document text
    • https://bagesasadav.weebly.com/uploads/1/3/4/3/134383367/poboresawumib-veruge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5ff605daf14a1.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/7fa7b9446.pdfIn PDF document text
    • https://mufejuraziga.weebly.com/uploads/1/3/0/8/130814984/kadufofu.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/siwaxejupofaziwepazo.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/rofokenutobewe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5ffa9fd9afa71.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/mojivikapeti/70605333404.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/gate._iitm._ac._in_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/application_of_calculus_in_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/voice_effects_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/wotokofaludutesuvofuser.pdfIn PDF document text
    • http://xakireponamo.rf.gd/power_vpn_pro_apk_cracked.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_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 5060 bytes
SHA-256: 205cd9379c1b735b41399429e478e26204df72f5cf7a12401057b2f5a6f138a1
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 10512 bytes
SHA-256: 36a61016fff14efc02033f5fc160540b9d7e4251dfa7b1cd4d8c8fa6b38b8214

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