Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d7fd3873bc3d76…

MALICIOUS

PDF

67.9 KB Created: 2020-12-26 22:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1ed23303b36804897b6f8a1dfbd997ba SHA-1: e6ced1e222902bbd12c4011df9b6b06780b0cb24 SHA-256: d4d7fd3873bc3d76c2a4719193c3af6362fc45a2745518b952f3b070b5a44477
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly hosted PDFs, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful 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 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://trafffi.ru/123?utm_term=gt+xpress+101+recipes PDF link annotation
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/064151f323c1.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/a25e9b090a.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/6894a4.pdfIn PDF document text
    • https://jirumovovajunu.weebly.com/uploads/1/3/4/8/134899481/4046789.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/29e8c8.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/2d627.pdfIn PDF document text
    • https://kexekogu.weebly.com/uploads/1/3/1/3/131384418/golen_vozus.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/nokiva/cephalometric_angles.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/printable_comprehension_worksheets_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/zajudowediwepepe.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/life_without_principle_henry_david_thoreau.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/99365339310.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_off0000ce1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1B 4976 bytes
SHA-256: c43298fb8feb453295b0132d5b7f499c5883c7356b127109059a53c61fe21147
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 10500 bytes
SHA-256: bcb072c43a9f1c868d76f8d7e9b01e0ec437403f40d237c5c8f1e203f028fc17

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