Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e8156196721880…

MALICIOUS

PDF

79.1 KB Created: 2021-03-02 05:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5cff4b7639c2b0f1baab0575f8626fee SHA-1: d98be568c0cbb890f4d293bbb1d38f3aaaffc69e SHA-256: 57e81561967218804eb90adbc84619005e170df18b3d88edfeb8194bbaf1718a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of approximately 30 external PDF links, suggesting an attempt to generate traffic or distribute further content. The primary malicious URL identified is https://golowaki.ru/strik, which is likely part of a phishing or content distribution scheme.

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://golowaki.ru/strik?utm_term=organigrama+del+departamento+de+alimentos+y+bebidas+en+un+hotel+5+estrellas PDF link annotation
    • https://sogakuguw.weebly.com/uploads/1/3/1/4/131453515/5cbe47fc4ab64ae.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/3210683.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/eSijRYp/super_truck_racing_ps3.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/RBHOYGx/xamamexuj.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/zewimujubonipek-kepon-wusomobo-muwuwododa.pdfIn PDF document text
    • https://jifimarug.weebly.com/uploads/1/3/5/3/135319291/6459772.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/kakef/whatsapp_status_love_video_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/china_asset_management_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/80988561018.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/41690398941.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/african_love_poems_and_proverbs.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/cards_against_humanity_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/math_worksheets_printable_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/45558722403.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/chapali_height_nepali_movie_free.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_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 5768 bytes
SHA-256: 12fa4f135a5744cedec07837658352be561510d3974deecb67fec80cf3f856c7
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 11360 bytes
SHA-256: cd300502b155929b468cabcf44cf83fe25ca956a3503cc4a876393c1101d3ec2

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