Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b59b4276fc9e181…

MALICIOUS

PDF

68.6 KB Created: 2020-11-23 14:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a959f7d4c39960d7f33ca3d3d2990597 SHA-1: d5aa79c18b774155a54a5580db619c0ebf40a6a7 SHA-256: 9b59b4276fc9e181a4e74c0092ad11605dbe7ae513e8912241dc4061d059acaa
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=cronograma+fisico+financeiro+de+obra In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5fa53f82ac183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_5fb42a88645c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fa2203c48cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f8c47b480280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_5fb4a78001b94.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/wixanarer/data_analysis_using_sql_and_excel_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063eb648-d0fc-424c-b2f1-d729a0062275/lonir.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/flat_rent_agreement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/wolijosuvibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4781b83a-3aa6-40ea-bf8a-a74865853484/buranuneluwemofi.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/54186384645.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/react_native_splash_screen_android_crash.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/vidunufix.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/zovumotakab.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/vatazoremux.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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 5356 bytes
SHA-256: 5f314a76f7882d6221ed6aab876deb6128b9fcc40019b4c08a3c7ab13857d122
font_01_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 12040 bytes
SHA-256: d5f714f2a3c7a3bafec755a9638e7ccd42801ef63d6e6a856951454b38b782a8

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