Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e953f8fce96ba5…

MALICIOUS

PDF

78.0 KB Created: 2021-02-04 05:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e5b9dbfa8aa26ae3ac06d0fbdaa988d8 SHA-1: 54e154bf7556f1376324b81c26f83b20a86b6101 SHA-256: 12e953f8fce96ba55e75cd7960b2ad715cae1f8b17d40143cfb60dc8e987a845
166 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document prompts the user to install a browser update or extension, a common tactic to facilitate malware installation or credential theft. The presence of numerous external URLs, many of which are on disposable domains, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/123?utm_term=sushi+go+card+game+rules PDF link annotation
    • https://cdn.sqhk.co/tozegatopaxu/8DcghiR/single_packaged_vertical_heat_pump.pdfIn PDF document text
    • http://kpupnov.pro/browser_update_button_crossword_cluewujnt.pdfIn PDF document text
    • http://lovelyhouse.online/free_video_collage_maker_app_androidnckxn.pdfIn PDF document text
    • http://virnet77.ru/admin_assistant_interview_questionszwr4w.pdfIn PDF document text
    • http://navalny.design/arterial_blood_pressure_definition_medical2qb3b.pdfIn PDF document text
    • http://autobaff.xyz/through_abandoned_the_refuge0nssh.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/2608377.pdfIn PDF document text
    • https://suruvimaweluza.weebly.com/uploads/1/3/4/1/134131456/9060488.pdfIn PDF document text
    • http://all-system7.xyz/infiniti_g35_manualh984l.pdfIn PDF document text
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/2331962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/holes_worksheets_by_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/color_blindness_test_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/4458742683.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 5456 bytes
SHA-256: 035b05f4d7733933d8e3a1ef619ae147cf43e36305aad5347200c2c5f9e53978
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10468 bytes
SHA-256: ea521869b2901d2c8df95c92837a5c1ebd40fac22cd1244791537c814a72f865

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