Malicious PDF — malware analysis report

Static analysis result for SHA-256 5429161077ffabaa…

MALICIOUS

PDF

84.4 KB Created: 2021-02-23 03:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4bd24af5f4508be8d5aeeea1141a1d6b SHA-1: 56045fd1a2f8ad787d3e38242438a747c2b93feb SHA-256: 5429161077ffabaac8341cef0c60381d78cc593a806f6b965627bf1de3cef25f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious domains and one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://baarspo.ru/123?utm_term=blomberg+appliances+reviews+uk PDF link annotation
    • http://legiontry.online/the_time_machine_wellsmykr9.pdfIn PDF document text
    • http://phillipen.online/kikapinasonuo9a52.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/diciezP/16375009688.pdfIn PDF document text
    • http://copyrightmediahelp.com/50120636112onqfu.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/polexebuj/pak_studies_9th_class_chapter_2_in_english.pdfIn PDF document text
    • http://belojegepi.epizy.com/mapofebuj.pdfIn PDF document text
    • http://vibesegajepo.epizy.com/boss_movie_video_song_pagalworld.pdfIn PDF document text
    • http://saxowuwu.rf.gd/vabubalenoriluvo.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/80701244505.pdfIn PDF document text
    • http://kopuperoki.epizy.com/canon_eos_20d_dslr.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/analytic_geometry_unit_1_test_answers.pdfIn PDF document text
    • http://jikatudito.rf.gd/how_to_learn_python_for_beginners_quora.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 5660 bytes
SHA-256: 303cff3d82b613f3fdd7dea4bbdcbbb348bcae6e1480c2bab5f3cf09ee693389
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 11164 bytes
SHA-256: 8000ae3d4b350108756280e6aa594a34e581516d9421f962ebaa0964301fa9c4
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16428 bytes
SHA-256: 4de993fdf65467371df45ae604b44199a0f9db96dd1987693d1d6f13b22e4334

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