Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b633f26d20ed433…

MALICIOUS

PDF

78.4 KB Created: 2021-02-03 09:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 21742606f4a12a6e2686c168748a9ae6 SHA-1: f028b1e5c154968854bb9b07ba0e9b0e5e73d2f5 SHA-256: 5b633f26d20ed4333adbe83a4c804bc0be63bcf4deb54e11785aa56d79eec4b9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. Heuristics indicate it functions as a link farm and employs social engineering tactics, specifically a 'Browser Install Lure' and 'Download Button', to trick users into downloading further malicious content from external URLs. The presence of embedded URLs and the overall structure strongly suggest an attempt to exploit users through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/aws?utm_term=core+java+tutorial+for+selenium+pdf PDF link annotation
    • http://microbladingeyebrowsdallastx.com/9p5la.pdfIn PDF document text
    • http://foyou.store/basketball_shooting_machine_gamez5ohj.pdfIn PDF document text
    • https://cdn.sqhk.co/dimawenibad/9z4gi34/that_level_again_2_70.pdfIn PDF document text
    • http://qrettalq.online/deductive_reasoning_worksheet_with_answer_keyzkzoy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fd2cd2824589.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/8e9334f1a.pdfIn PDF document text
    • http://streamsweets.com/zajulab9dc3u.pdfIn PDF document text
    • http://umdtheatre.ru/sideways_arithmetic_from_wayside_schc59gn.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/6195573.pdfIn PDF document text
    • http://krokoboko6.xyz/marvel_timeline_moviesa8zig.pdfIn PDF document text
    • http://savadaqwe.space/fezonufagilesaxovonago63ptb.pdfIn PDF document text
    • http://leopolds.space/49887574280qmx9m.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/buligasi.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/firudegix/deacon_ordination_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/reporting_binary_logistic_regression_apa_style.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/2010_challenger_v6_performance_upgrades.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5228 bytes
SHA-256: fc9716317fdbb6f2030a9b9a5d7c33bb518d801ac727a31265606d843a25e26b
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 13120 bytes
SHA-256: 0c9864939b254134aaeab8c7c59e2c768a4332738a502f5fa857f013b5c12f50

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