Malicious PDF — malware analysis report

Static analysis result for SHA-256 7973873fcece4716…

MALICIOUS

PDF

70.8 KB Created: 2021-03-26 05:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ddb68fb4c50eda2d274470b558535ec9 SHA-1: f1cf5e3623da8b1031d35d77678f3bdd784073cc SHA-256: 7973873fcece4716337e551fc8fb20b094b8809c39c53297558f17cf9da7a596
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://dafemum.ru/123?utm_term=britax+b+ready+stroller+user+guide', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=britax+b+ready+stroller+user+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_6002449ece5fd.pdfIn PDF document text
    • http://choosemadam.site/walmart_open_tomorrow_morningi5ez5.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/tnibV7s/tollywood_telugu_ringtones_free_download_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/rhcgcal/website_template_for_designers.pdfIn PDF document text
    • http://chaptejvxz.fun/11059243571buvbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409998/normal_5ff33bd11ceef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_6043e636269ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_603a3f8bba77a.pdfIn PDF document text
    • http://pestore.pro/kubenukagaminofa3kiol.pdfIn PDF document text
    • http://adminhalil.com/xalukitasiwitorjlikh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5fe47553280b3.pdfIn PDF document text
    • http://tosety.xyz/kite_worksheets_geometrynzsdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fe4f0d77c0a2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://ukranews.icu/554270481076ulqe.pdfIn PDF document text
    • http://datingsexchat.site/juzeneniramubekudijo38iiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_603e34f7c9cfa.pdfIn PDF document text
    • http://all-system7.work/fosifo04fn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_dd7cf787f93c434b817ae0f4ec1e4049.pdf?index=trueIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_134f71a8418e4e3b92f04549114c6f16.pdf?index=trueIn PDF document text
    • https://d8aee3b0-83ea-4a0d-b8f9-524a85b41d10.filesusr.com/ugd/105b34_e5bca98b5b204c9288f29cfb4ebaad1b.pdf?index=trueIn 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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 5352 bytes
SHA-256: 6788929730ddb8eafcbebf4b2b8b4147c3861cfc63b774f65a3f64bdea4a54fd
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10468 bytes
SHA-256: 311a079ed47081bc072a5cdf2d0299865f060c7999783290922c68c463b4b40c

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