Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6087d2e2ddf83c…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 09:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b5e69059f1f5d0329253a8ee5c92182b SHA-1: 04f83cf96da77a8194e5ad2f246c9c93c6f2cf51 SHA-256: 0f6087d2e2ddf83c4a494d50088aa93ab39e277aae8b2248beca710943ee51e8
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous URLs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful content.

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
  • 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://pelibifir.ru/strik?utm_term=dual+federalism+vs+cooperative+federalism+vs+coercive+federalism PDF link annotation
    • https://cdn.sqhk.co/wafexumu/jdiibtq/exorbitant_in_a_sentence.pdfIn PDF document text
    • http://visobewitumimek.22web.org/what_is_the_most_popular_animal_crossing_game.pdfIn PDF document text
    • http://lulaterunudagob.iblogger.org/beethoven_piano_sonatas_score.pdfIn PDF document text
    • https://cdn.sqhk.co/tupizurelir/jjghjjj/robert_frost_middle_school_bell_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/hgtxEhe/not_pacman_apk.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/8044821.pdfIn PDF document text
    • http://bonapimum.iblogger.org/latex_beamer_title_page_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palipesokugukux.epizy.com/cartoon_full_video_song.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/brandenburg_guide_eu4_1._28.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/33737849614.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/discriminant_function_analysis_reporting_results.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/puduvimov.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5360 bytes
SHA-256: 6fcaf8fd0a7d67e56ff87cd01650f66823cf3213f4eb6d661643acc7c51eaac0
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10228 bytes
SHA-256: 66727b7d175bc2e02879b2eb2fb29f9b2aa95c7a6348240f8866bb714ac9c1d7

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