Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f5aec4c9488ec7…

MALICIOUS

PDF

75.5 KB Created: 2021-01-14 07:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7ceb579a7eb015a83b6eede77761d306 SHA-1: ed48f35c041b9160151be6d0c8eef6c83aa4bac0 SHA-256: 25f5aec4c9488ec75b8df3e1c62b3d58a565e09d3eba61e41c1de7c14f75393c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The embedded URL 'https://trafffe.ru/123?utm_term=accu+chek+multiclix+finger+pricker' is particularly suspicious and likely leads to a malicious resource. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely related to phishing or malware distribution.

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 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://trafffe.ru/123?utm_term=accu+chek+multiclix+finger+pricker PDF link annotation
    • https://dufeduvu.weebly.com/uploads/1/3/4/4/134481569/331ddb2.pdfIn PDF document text
    • https://bexavulurezil.weebly.com/uploads/1/3/0/7/130738929/tiwex.pdfIn PDF document text
    • https://gupimarozak.weebly.com/uploads/1/3/4/3/134350981/5e9654bd7.pdfIn PDF document text
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/riref.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/jchihbz/suzozidotozonojaweko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/wevixebojidenuboj.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/chemical_bonding_ionic_covalent_metallic_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/gaduradibazet.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/1237684117.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/61290410944.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/show_battery_percentage_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/cisco_packet_tracer_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/afc_ajax_nv_annual_report_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 4936 bytes
SHA-256: 99326d264e8c45712283a0add44b219e5051ce081df6ff5a35c3ec66ab366b56
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 10888 bytes
SHA-256: a040be4f02e8948974f6e10e45e27ffb7f47112cf13edfde7450fce4b59962a7
font_02_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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