Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84413baabe30a73…

MALICIOUS

PDF

74.1 KB Created: 2021-02-09 04:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b1623835499bf9f131903d9479ccd04d SHA-1: 3d3eaed38121d00a82b57d9174064d4dfcfab5e5 SHA-256: b84413baabe30a73ae9e5f337274480e77dbccf5bd36c177aa954083a2aeb6bd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to potentially malicious or disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wb?keyword=what%20is%20comprehensive%20agrarian%20reform%20law In PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/3602553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5ff0179b4e28d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5ffde5a8d7168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5ffc9b74c6410.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/2298867.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/bfb154b0c07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fce8a3e667c8.pdfIn PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/4cf22e.pdfIn PDF document text
    • http://spindlndou.space/88686222368dy3s2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/joniwosoj.pdfIn PDF document text
    • http://nawogov.epizy.com/monthly_household_budget_template_excel.pdfIn PDF document text
    • http://vuxomukixade.epizy.com/shawn_and_camila_senorita_performance.pdfIn PDF document text
    • http://bezepegu.epizy.com/8951440063.pdfIn PDF document text
    • http://welidigukiru.epizy.com/virus_definition_update_failed_avg_android.pdfIn PDF document text
    • http://vutekumini.epizy.com/88264125675.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/sirijipaserafi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 5384 bytes
SHA-256: 63f0196b2a2c3525d833004f9bf31fd748f8cffde5419599f30d5f7614520f62
font_01_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 10636 bytes
SHA-256: 261e1b4968a7c301a6168bc8e6b607d395bdc7e47b8cbe792d6c37349ff8fe31
font_02_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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