Malicious PDF — malware analysis report

Static analysis result for SHA-256 57437913965d176b…

MALICIOUS

PDF

74.5 KB Created: 2021-01-20 12:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 51b77756b4cc5daf3e9414f5c1af5bc1 SHA-1: 9978195475b096bbde2601431bdc1a1573fb4258 SHA-256: 57437913965d176bffa4ac693145894f4f1b49c8d663b771224784437351f79c
254 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. It also contains a significant number of embedded links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The presence of multiple PDF link lures and the ML classifier's high confidence score indicate a malicious intent, likely to lead the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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
  • 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://trafffi.ru/123?utm_term=instant+street+view.com In PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/6358164039.pdfIn PDF document text
    • https://site-1255209.mozfiles.com/files/1255209/uncle_drew_movie_soundtrack.pdfIn PDF document text
    • https://site-1168265.mozfiles.com/files/1168265/novomejuponixemujepavuta.pdfIn PDF document text
    • https://site-1173313.mozfiles.com/files/1173313/vumuko.pdfIn PDF document text
    • https://site-1212500.mozfiles.com/files/1212500/lovelace_movie_cast.pdfIn PDF document text
    • https://site-1247386.mozfiles.com/files/1247386/jobozesinavikekelarov.pdfIn PDF document text
    • https://site-1175852.mozfiles.com/files/1175852/boomless_sprayer_calibration_worksheet.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/kidubokoputemekovew.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/vapite/java_callback_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/bitencourt_direito_penal_parte_geral.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/xexifuzaraboxikunodek.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/audit_report_of_infosys_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/24358904872.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/caatsa_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/technic_launcher_pirata_atualizado_2018.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 5036 bytes
SHA-256: 71d94cae1698b2d09df2990d802defe264e2811fe4c7805b50a46bcaceda3a8a
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10408 bytes
SHA-256: c6d042e5a793561be701163d9eef5a47b48812be4473143d0211462918cf2947

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