Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f2117e4fb786fb…

MALICIOUS

PDF

76.1 KB Created: 2021-02-27 21:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 30133c6fe3b81cf874ba49f4752b7e1d SHA-1: 3ab89ca7736c40d84c143ec9486fc331806bf8af SHA-256: 23f2117e4fb786fbd22c8ca7384815ca5a80b36e6c85305f32908a0653f79fe1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('resalured.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly suggest this PDF is designed to redirect users to malicious 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://resalured.ru/strik?utm_term=gre+practice+test+sample+questions PDF link annotation
    • https://cdn.sqhk.co/nadokikado/dgheUjg/spelling_games_for_5th_grade_online.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/qcy_bluetooth_headphones_price_in_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/gZejh0M/boat_parking_3d.pdfIn PDF document text
    • https://mawovajexajadow.weebly.com/uploads/1/3/0/8/130874262/sonapajogezo_jipiravowiroze_fijubavudagawe.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/YAhhjiz/is_jiomart_available_in_usa.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/luwax-jezubupidoxogi-logalowikolup.pdfIn PDF document text
    • http://fenofaxizuva.22web.org/mitosis_cell_division_station_activity_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/V23hjjj/fast_and_furious_spy_racers_cast_dom.pdfIn PDF document text
    • http://wolotalute.iblogger.org/charanjit_channi_songs.pdfIn PDF document text
    • http://gezudozu.iblogger.org/breakup_whatsapp_status_video_song.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/lejivugeleguwod/laravel_install_phpoffice_phpspreadsheet.pdfIn PDF document text
    • http://fofepiroxazu.epizy.com/lexafigawaremulo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/bojomorejapo.pdfIn PDF document text
    • http://batawovajupofu.rf.gd/18753861786.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/fonufuzozipiwebezuguz.pdfIn PDF document text
    • http://rovunebezub.epizy.com/broadlink_sc1_manual.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/bulletproof_theme_song.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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 5236 bytes
SHA-256: a1e6590ea845d3337151a3669c77e17756561a60dd9ddd2daf98e5dbf245b8a4
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10320 bytes
SHA-256: 74f6ec7a60002ebd455bea10659d94b7a9e0dfa66eeb0310fab8930a18982e1a

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