Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc3919ca8147e99…

MALICIOUS

PDF

109.4 KB Created: 2021-03-15 00:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bbd0c1a226215e908d1efb327eb7bfe5 SHA-1: 9e98219921c0ff4b65eb080e2d9d66ba503112ff SHA-256: bdc3919ca8147e99ebf0bf0fe7cd2def5c0b522e8e96457d50708aa641004ae5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=remington+700+action+length PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411252/normal_60244cb3583b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_602c20e19aa7e.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/zolefut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5ff5d062016d1.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/atomistique_cours_et_exercices_corrigs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_6032a314bc4e4.pdfIn PDF document text
    • http://fufetaka.iblogger.org/santoshi_mata_ji_ki_aarti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_5fda1b4cb825e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5ffb995681f53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fcea79a5bd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_601647052adbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_6041d867d9ddf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tobaziw/8211348004.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/cuestionario_de_habitos_alimentarios.pdfIn PDF document text
    • http://tosurok.myartsonline.com/14045233677.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/how_to_connect_brother_printer_to_wifi_dcp-l2550dw.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_1726b77c93fc45ee8274ae3c0ac77b28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/mcent_browser_apk_old_version_2018.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_d6102b8ee02b435c9d9a72fc4e44dbfb.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_7c78311d86a94b82bc44eaa48ea23b42.pdf?index=trueIn PDF document text
    • http://lemutuzuvaw.rf.gd/best_online_project_management_certificate.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_b51763e1a96542bcbf0d6eefaaa3daa7.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_5ee8b27bed954d05a4c940134663811d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/office_365_excel_tutorial.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14764 4956 bytes
SHA-256: 9ef12627ee008d304313db7261cf19f1bd0b9b847c6da95eedbe5e87a3e3e4ec
font_01_sfnt_off00015814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15814 12760 bytes
SHA-256: a3226e64bddd227217c4bc229c19f57926988c3c54f8705c4080fb7ac8e66327
font_02_sfnt_off00018336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18336 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
font_03_sfnt_off000197ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197CA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c