Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fd05ec50151550…

MALICIOUS

PDF

89.4 KB Created: 2021-01-21 08:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d5e7e083bcd6b084bad189b5e5c0dd41 SHA-1: d5902c9d5e47b0cd746b8c5e504d8855f73e1199 SHA-256: 51fd05ec50151550b27f774ee0bed855d3e32d2986f29967764fb2cd91733188
284 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to redirector infrastructure and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead the user to a malicious site, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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
  • 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://yafferge.ru/wb?keyword=write%20on%20pdf%20app%20mac In PDF document text
    • https://cdn.sqhk.co/zowonefaso/eOUMjdl/weather_atlanta_november_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/jgjjcjh/cars_movie_soundtrack_route_66.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/eidKieY/horror_skins_for_mcpe.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/nobosuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_5fba9551ae67c.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/F9ILhhL/92072427536.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/exBNrO5/marukukugu.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/bagotofuxaz.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/7096659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5fe437b027e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5ff2752a4b793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momugegunimex.rf.gd/zubejufenuwuvafewu.pdfIn PDF document text
    • http://pavasokunise.epizy.com/brahma_kumaris_tamil_new_songs.pdfIn PDF document text
    • http://pazokidewuwi.rf.gd/62417556115.pdfIn PDF document text
    • http://datasixiva.epizy.com/austria_visa_form_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/xujav.pdfIn PDF document text
    • http://lojetewope.epizy.com/rejubetelerepoguj.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_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 5104 bytes
SHA-256: 1c0f3332061d352fb900822f69eb281fd0d7fc356be7471804e10daf48e46e81
font_01_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 11156 bytes
SHA-256: bcfe7b60d8e36e06a1c3404eab952256372256f4c21212a0279de4c63939c958

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