Malicious PDF — malware analysis report

Static analysis result for SHA-256 551fd7e7c6b86d85…

MALICIOUS

PDF

80.9 KB Created: 2021-02-26 02:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4f9abb1d0bede1f2af6b29f0fc6ff59a SHA-1: 22222e671f791ca9758c7817d77deee414e90645 SHA-256: 551fd7e7c6b86d85680bd909e6100287892b0ae43c8ad32d80c4b7becbebabaa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant portion pointing to domains that appear to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://druttle.ru/award?keyword=how+to+win+friends+influence PDF link annotation
    • https://cdn.sqhk.co/xeloxilava/ejcKghb/91371691501.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/nalijotujupu.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/cjdClsJ/50859283225.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/sasavirigonuvurid.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/KKchbhb/47638806593.pdfIn PDF document text
    • http://bazis-rostov.com/368843394387xx3p.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/35457108001.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/hgjdieV/jewatawenemepigot.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/novipaliwid/nonprofit_annual_report_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/93068649475.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/pazapivuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/wowogaturerudejitul.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/hundred_chart_patterns_worksheets.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/lopazogabeta.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/tesaxujizitobusubuk.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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 4856 bytes
SHA-256: 05bf941d5912feb1b3ebc90c767a0f23738ead3d86808f589bec1e6265c161ac
font_01_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 10116 bytes
SHA-256: d96faef9efe3a6f73fd8304262d1bf5c64bc2de0e702104a5193bfc20b2693d7

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