Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc10b6d4076c424…

MALICIOUS

PDF

70.7 KB Created: 2021-02-19 19:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2d7e3e916a51114f7962a6fa8fa0dd16 SHA-1: fa4d84fc9862c6c8f2bf68f31a0fa799cf8aa7f4 SHA-256: 5bc10b6d4076c42403c4fde214bb68fe49ea4ffa17c3160775cfcad6bee704cf
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=marshall+high+school+san+antonio+tx PDF link annotation
    • http://money-team.site/aldi_sd_karriereportaly4hxy.pdfIn PDF document text
    • http://povar2020.site/97823580402v7fce.pdfIn PDF document text
    • http://siankaanmexico.com/zesejezepe3snw0.pdfIn PDF document text
    • http://cookwellbakewell.com/43122238276etu66.pdfIn PDF document text
    • http://domifonupesif.iblogger.org/racing_games_for_pc_full_version.pdfIn PDF document text
    • http://uscovidcharts.com/fortnite_v_bucks_generator_pro_2.27iz04y.pdfIn PDF document text
    • http://mnogolidov.xyz/62212979959yqwuc.pdfIn PDF document text
    • https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/6e9c6c95d25da.pdfIn PDF document text
    • http://choosemadam.site/94836629766emsa0.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/jagulefarobulu_zovaxunizewijud_nujevan.pdfIn PDF document text
    • http://istlan.fun/ruzizeojdh5.pdfIn PDF document text
    • http://rosebip.22web.org/15895312814.pdfIn PDF document text
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/46612041352b1c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoloxufiz.epizy.com/rejorokapi.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 5136 bytes
SHA-256: 3049dac32ba685fc24888972e3f1e8d6187903d43ef98dc48e1b456a108dfecc
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 10680 bytes
SHA-256: 4080318c9a81cd1893ec787dd69d50142e4b1f9002cfbd58bbf8613a61290320

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