Malicious PDF — malware analysis report

Static analysis result for SHA-256 507fb36e7403eb86…

MALICIOUS

PDF

79.2 KB Created: 2021-02-19 14:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6bb93d282af411c1439d274530eed048 SHA-1: 1fde85edbddaa0a71ce1d414405eb00dc3228347 SHA-256: 507fb36e7403eb86beb9388bb6fba9c4ed1357c46ed72ad5a7e8d7e672abbfd5
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The ML classifier output of 0.999687 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=bissell+crosswave+pet+professional+reviews In PDF document text
    • https://zoxutelipiroga.weebly.com/uploads/1/3/1/8/131871488/xurolimumekebo.pdfIn PDF document text
    • http://topmassage.net/35469591352nbvmw.pdfIn PDF document text
    • http://llloooodddd.space/gloomhaven_tabletop_simulatorea1gw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_6015896b2a598.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/Liajidz/78573373534.pdfIn PDF document text
    • https://zoludapi.weebly.com/uploads/1/3/4/5/134528767/kosowututupoxal_kinusewudez_sibun.pdfIn PDF document text
    • http://xopijodujakik.22web.org/pobibok.pdfIn PDF document text
    • http://nuzoxej.iblogger.org/inspector_lewis_2010_episode_guide.pdfIn PDF document text
    • http://karaulovlife.site/zebra_zp_505_driver_windows_10edhe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_601b329db6cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_600a50c2340e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_601b985a1365a.pdfIn PDF document text
    • https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/4629180.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/7ahi8cX/diableros_zombie_rpg_shooter_mod_apk.pdfIn PDF document text
    • http://xojokare.iblogger.org/motor_vehicle_log_book_template_ato.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fcf4e93c5423.pdfIn PDF document text
    • http://world-wildshop.com/bivosuluxejufux3bl6u.pdfIn PDF document text
    • http://dovejeve.22web.org/badorigixubuvobusabo.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/030d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_6027446878307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5feee3eb878ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 5208 bytes
SHA-256: 8cbac8f787c2355ebdf6a62e30e3d10cc0ba7548b635634b7906c082583f3cce
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 11012 bytes
SHA-256: 8160d3d03576bbd6b6558d010df7f201b460eec244b94dbeecacef49e313474d

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