Malicious PDF — malware analysis report

Static analysis result for SHA-256 7407109283546b7f…

MALICIOUS

PDF

73.5 KB Created: 2021-03-23 17:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9aec545963f8358a244b6e4b0df0a94c SHA-1: 776b52e69c8588e9fb4aea7a21e430eeeb9edf4c SHA-256: 7407109283546b7ff8db7fc3405a30d418b362159d7cbc90f57a79dfd1f9caf6
196 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are suspicious and appear to be part of a link farm designed to lure users to download further malicious content. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, and PDF_SUSPICIOUS_LINK_LURE highlights invisible links to suspicious domains, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://resalured.ru/award?keyword=tipos+de+articulaciones+del+hombro+pdf PDF link annotation
    • http://help-business-media.com/27793379350flypf.pdfIn PDF document text
    • http://frasqen.online/408238395jf7pw.pdfIn PDF document text
    • http://online-bestshop.xyz/free_download_autocad_for_students_and_educators_autodeskqytsv.pdfIn PDF document text
    • http://zilofunawoson.iblogger.org/48853608563.pdfIn PDF document text
    • http://bio-ita.fun/cwna_guide_to_wireless_lans_3rd_edition_download_freedx25j.pdfIn PDF document text
    • http://managerprogram.live/lakshmi_hrudaya_stotram_teluguxsnd0.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/infographic_excel_template_freee3bb6.pdfIn PDF document text
    • https://mozufutedubido.weebly.com/uploads/1/3/4/5/134503110/5342246.pdfIn PDF document text
    • http://olymptrade.buzz/vukezuxusemisagkfbpy.pdfIn PDF document text
    • http://klyshsheff.xyz/68496464390yjzs3.pdfIn PDF document text
    • http://sarhello.online/sipadotupufegasaxepavonu8e6c.pdfIn PDF document text
    • https://gitasojozatoj.weebly.com/uploads/1/3/0/9/130968906/2521151.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/rilexazejuzovep/95932847157.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/jovomoriw.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/vofeniwiniwow.pdfIn PDF document text
    • http://vuxupib.epizy.com/how_do_you_adjust_a_riving_knife.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/android_emulator_memu_play.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/80359645333.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_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 5484 bytes
SHA-256: 0afc5ea4cd42195d6e56e62192ec6f4c09bc65ec17564f09435c27b4950dada9
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 11240 bytes
SHA-256: 8433ae2d9fc8a7a7e413e5d35b455866953a8152c3d0112aaa44f18853da3c2a

Open this report in the interactive analyzer, or submit your own file for analysis.