Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e0be433cb607f6…

MALICIOUS

PDF

80.2 KB Created: 2021-02-16 02:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 01cc7777c569f4dd68fd75f207f4eb4d SHA-1: 9d12d1e77871f321e8a303e3f5cb3ca3d9bbf898 SHA-256: 87e0be433cb607f6acd80a9fb8a41f4ccdaec1dc2266ca2829dbd13b0d07c56d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of UTM parameters in some URLs indicates an attempt to track user interactions with these malicious links.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=cause+and+effect+text+structure+anchor+chart PDF link annotation
    • http://znakomstva18x.site/87430340786crsv4.pdfIn PDF document text
    • http://physcoo.com/16063232614qrsf3.pdfIn PDF document text
    • http://biggymstoe.com/40271332287uigp8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fcc6fdc1065f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fd71adca13a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fefddfd911f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd16025d051d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_5fdafb8fe9e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fd8b20cc8d95.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/hFijgcs/2178664219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_6011433ab5e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_6013b1658ce07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_600c832346a6c.pdfIn PDF document text
    • http://good-production20.site/clash_of_clans_private_server_apkyzr6g.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/gewisetug/characteristics_of_a_transformational_leader.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/daxujutojawojolokilera.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/8412771598.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/vupowafitanuzezejoxelopef.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/cachila_arias_informacion.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_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 5048 bytes
SHA-256: a9523a807c28b95b9f26c22573e1d407983ff991c542b83e996173e5e73a48b0
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 10648 bytes
SHA-256: 0ad85e22c7d7fe1512a254bbe25badf084c1aa3228ff2ccfb7765004cd57a0c2

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