Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43f31f8285b8f18…

MALICIOUS

PDF

106.3 KB Created: 2021-04-09 20:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80bd1fef37dc21cc5d35dab78f2023cf SHA-1: dcd5cac61511ffaf7ab7a8076546f4eb43519437 SHA-256: c43f31f8285b8f18cb760ae13ba04cdc9b5d44e3aa155beefa33dbb14dd3cb2f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=pioneer+avh+p4400bh+reset+button
    • http://vibubag.22web.org/cintas_uniform_services_dallas_tx.pdf
    • http://mibemuxagegija.mywebcommunity.org/arnold_toynbee.pdf
    • https://cdn.sqhk.co/retagigimusa/ghbgfKb/bajawe.pdf
    • http://tekabufoj.22web.org/41606462162.pdf
    • http://mokaxizekebade.scienceontheweb.net/what_is_the_equation_for_angular_velocity.pdf
    • http://kulokozataxat.22web.org/8328238815.pdf
    • http://bugelojuta.iblogger.org/muxurupomazosun.pdf
    • https://cdn.sqhk.co/joxudilabi/gjjfjid/fine_egyptian_cotton_sheets.pdf
    • https://cdn.sqhk.co/nimotixalulo/7K7cbgh/virtual_families_3_stomping_ants.pdf
    • https://cdn.sqhk.co/baxijaxazixi/jh7rig8/rakebekalelidojenotedam.pdf
    • http://tukameduk.22web.org/74911314096.pdf
    • http://xonigej.mypressonline.com/fekorerabakufijupibedi.pdf
    • http://lusiwemu.22web.org/digital_business_concepts_and_strategies.pdf
    • http://warixedivukinat.mygamesonline.org/nesuwabepux.pdf
    • https://cdn.sqhk.co/xedufoga/jujaOE9/defence_force_application_form.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dukivudote.epizy.com/97716059175.pdf
    • http://fowodusozid.epizy.com/annotate_iphone_app.pdf
    • https://uploads.strikinglycdn.com/files/99e93ef9-b7ab-46c9-887f-b838bdf8cb49/nikon_fg_film_advance_stuck.pdf
    • http://godubaxedija.rf.gd/21488549080.pdf
    • http://lipubumili.epizy.com/pl_sql_and_sql_difference.pdf
    • http://kiduxoz.epizy.com/gegatodosagesoba.pdf
    • http://gokefiz.epizy.com/27318593319.pdf
    • https://uploads.strikinglycdn.com/files/97a7948e-6fd4-47c5-888a-adf7396cffe7/omron_blood_pressure_monitor_model_hem-711dlx.pdf
    • http://xovebezot.rf.gd/blastocystis_hominis_tratamiento_en_nios.pdf
    • http://polilofu.onlinewebshop.net/bigole.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015522.bin
58f806f6c866d86b8e5f187ed59b59fdc09205da75555e904b14da5ea68ed814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15522 5188 bytes
font_01_sfnt_off000166b5.bin
9217f2307480eca7021116e382f79dfbf49f5ce2c1fb2d6c7f28af140858be33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166B5 11208 bytes
font_02_sfnt_off00018ca8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA8 4324 bytes

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