Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac470e998d77d63d…

MALICIOUS

PDF

81.8 KB Created: 2021-04-24 17:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e3cdc48ff37f0d768392fa03218583 SHA-1: 12546274f4b4b7cbface43cfcb7ab2b183fe2930 SHA-256: ac470e998d77d63dd90773aa44b08b40d3c96d457a70ae7e6974e3f6d2526454
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=aspects+of+good+academic+writing
    • http://tetupamino.mywebcommunity.org/kefep.pdf
    • http://ladekepevij.mygamesonline.org/woxuzedefutikelel.pdf
    • http://rojibitakuvekuw.scienceontheweb.net/agile_project_management_books.pdf
    • https://cdn.sqhk.co/kokademesuz/52jfqhd/my_pcc_login.pdf
    • http://nawitebexu.medianewsonline.com/5564904728.pdf
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/5456672.pdf
    • http://mitedujonajezed.scienceontheweb.net/diwonukaxofimodelereja.pdf
    • http://fejiximodanu.mygamesonline.org/87424326409.pdf
    • https://kimilirakafame.weebly.com/uploads/1/3/4/6/134659192/vutejilak.pdf
    • https://cdn.sqhk.co/wajerewuwer/Lnghygf/sujamisodo.pdf
    • http://redirerer.medianewsonline.com/rituwuwokolonagoj.pdf
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/645030183a1.pdf
    • https://cdn.sqhk.co/notenirikev/jjhfHV6/nedewujisitep.pdf
    • http://sunazeremitiwu.mypressonline.com/isoamyl_alcohol_msds.pdf
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/nujisu.pdf
    • http://sawedes.mywebcommunity.org/asterix_y_los_pictos_gratis.pdf
    • http://javaxirivibewi.mygamesonline.org/general_system_theory_definition.pdf
    • https://cdn.sqhk.co/ponesigis/hjhgtrS/jufiko.pdf
    • http://wigemefigiw.mygamesonline.org/67819148485.pdf
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/738c43b3143.pdf
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/nukugobu_jekelunofewil_zerebu_rexopozelufilok.pdf
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/banomoxe_zulefuxalo_raleg.pdf
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/kesubixuzir-nejekulu.pdf
    • http://vawurabel.mygamesonline.org/piwagepipenafujutesukadal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off0000f3a1.bin
37cb77bdc0ada6820739baa69125a7efa1d2f8803180ec5ae1fdefe54debe91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5312 bytes
font_01_sfnt_off000105a1.bin
9cf3f11524103429cc11f3446996646b56c1fdc8f7a1023952bb975235a2e28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10896 bytes
font_02_sfnt_off00012a22.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 4324 bytes

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