Malicious PDF — malware analysis report

Static analysis result for SHA-256 86335c86da675d32…

MALICIOUS

PDF

87.2 KB Created: 2021-03-26 09:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: becefdfc881c9e0b0b656113f9715012 SHA-1: 5a2644611a7e122559d350ea05bcd60b575b3a8c SHA-256: 86335c86da675d32714d9038bb047b2e81a474fd29fad2f0eb851322aa9d4e97
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with one prominent URL pointing to a site that appears to be a link farm designed to attract users searching for game-related content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or malware distribution site. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bologen.ru/wix?keyword=fnaf+sister+location+unblocked+games+77 PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/ihhhijh/duduxepakudazazunev.pdfIn PDF document text
    • http://com-servers.online/71713177879q0ec7.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/mugodiwivikejujjbda5.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/dilawejopelanipikuf.pdfIn PDF document text
    • http://xorudaz.iblogger.org/sutuja.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/sound_of_crackers_bursting_free.pdfIn PDF document text
    • http://wasodez.22web.org/47908381484.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/2FwYgc1/endless_jungle_prince_run_hack.pdfIn PDF document text
    • http://wuxijuvusif.22web.org/22595883471.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/amgcvXQ/20635055152.pdfIn PDF document text
    • http://xebupalifu.22web.org/handwriting_sentence_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/jVxzad6/minecraft_2b2t_timeline.pdfIn PDF document text
    • http://formverifiedbadge.com/g_shock_casio_wr20bar_manualqr9ug.pdfIn PDF document text
    • http://jodujimapiwox.22web.org/latex_source_code_for_seminar_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reginujijuf.rf.gd/2580687168.pdfIn PDF document text
    • http://muwalolerede.epizy.com/muzutis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99055ed1-19c2-408f-8b78-649e78cc7e78/40586640454.pdfIn PDF document text
    • http://wisiver.rf.gd/varicela_en_los_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d33e10f-c09c-41ef-aa14-f4c0b5623fd2/johnny_appleseed_story.pdfIn PDF document text
    • http://novuzebires.rf.gd/zumir.pdfIn PDF document text
    • http://nibewisule.epizy.com/bahria_town_karachi_ali_block_map.pdfIn PDF document text
    • http://releboxodaw.rf.gd/wibizodasireba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48add32f-fcbd-42e5-b2b5-01037e275f96/65115520170.pdfIn PDF document text
    • http://zixaxonenugoko.epizy.com/lucent_english_grammar_book_free_download.pdfIn PDF document text
    • http://dasopikabuma.rf.gd/kisofoxatagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185a407b-886e-42f1-bf35-7b732c35fee7/87782639451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa75bf9-5062-41c7-a02d-a9b951967980/piboman.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_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 5580 bytes
SHA-256: e754f496ff1524f67d8c4d380a7f67ef5f5575e75593f0b3b6a6c8782b2177e6
font_01_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 11496 bytes
SHA-256: ff287586b981f2d18284ac117e78ea516098bf5102f9ea6339f12adf27e9c0ba