Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0962b854d250d7…

MALICIOUS

PDF

80.5 KB Created: 2021-02-10 23:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28e47f82bfa9869c140e0a259193d099 SHA-1: 77dcbf43b8f21e3321688152d9141328699f0bc3 SHA-256: de0962b854d250d767954338d531e1b1c61d3828e899519f4a822592ed4651e7
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary focus on 'https://seumenha.ru/wb?keyword=outlook%20auto%20response%20template', suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/wb?keyword=outlook%20auto%20response%20template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5fe785fd0cef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_601869469ee05.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jaMje2Q/fuxesarofabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413474/normal_5fe4801ede476.pdfIn PDF document text
    • http://wisumezuj.22web.org/kagas.pdfIn PDF document text
    • http://maxufadewodov.22web.org/1035049575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff666b644581.pdfIn PDF document text
    • https://pukunave.weebly.com/uploads/1/3/5/9/135957849/3488319.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/hbgdgcW/game_throne_rush_offline_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/eKGHjfk/lelorevazixowazixapewe.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
    • http://lobulowigewimu.epizy.com/free_consignment_inventory_tracking_spreadsheet.pdfIn PDF document text
    • http://defizal.epizy.com/what_are_your_career_aspirations_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/31881346709.pdfIn PDF document text
    • http://texazufuvo.rf.gd/69449845716.pdfIn PDF document text
    • http://kalawutef.rf.gd/ielts_book_9_listening_test_4_answers.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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 4888 bytes
SHA-256: 7145bf7b0480dd07005c7fbac12ebaab88a92055ead2e93eb8129725241bdf21
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 10824 bytes
SHA-256: 8c904c1d58758e5b8795b1beed1441d75008a185d4ebdd1329040f2f2a392e39
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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