Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21378841b56b596…

MALICIOUS

PDF

72.3 KB Created: 2021-01-26 03:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 884fd4f7dca6d684dcea4fc4614829b0 SHA-1: a01188d354f6e0f065de4bd986be3e0a2d8dbbd8 SHA-256: b21378841b56b5963d4708d54a330e9f44d05e6213b73f74c1f70f75eee7d495
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=pressure%20washer%20rental%20walmart In PDF document text
    • http://limowoduramu.iblogger.org/luxobutunabolatemaliwot.pdfIn PDF document text
    • http://steelsho3.club/41588515869azvch.pdfIn PDF document text
    • http://phrensy.co/7_words_not_allowed_on_tvomckk.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/e4hj0JJ/w3schools_php_mysql_connection.pdfIn PDF document text
    • http://bettermoneytips.com/shoot_em_up_trailer_deutschwdoay.pdfIn PDF document text
    • http://sarkife.site/futekopamomun9b.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/gcY00hj/smart_tube_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/ii0Eijj/list_item_mobile_legend_2020.pdfIn PDF document text
    • http://itasummer.fun/best_ceramic_artists_on_instagram5ieom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fde406e765b3.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/fijefatiwus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukejujegu.epizy.com/boyle_alberta_weather_report.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/iliamna_air_guides.pdfIn PDF document text
    • http://wafogaz.rf.gd/economics_circular_flow_diagram_template.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 5016 bytes
SHA-256: 9a43c98527b7b875ff5d5a3bdc5eaebb5b5f3d0e7f6b5099da20b20ce7b372bd
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10436 bytes
SHA-256: a5fd6d87285d62c7d059c11793417b33c816e968356bf8a490ad4f5ab1d1e09c

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