Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d6405aa18bfdae…

MALICIOUS

PDF

74.9 KB Created: 2021-10-04 14:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b368108eec292597e7afd29324b0e919 SHA-1: 37d04770c4399a0867c5c701e52a8dd29e2e9c5f SHA-256: 86d6405aa18bfdaea1d50e339c0929ed3c73520af4ec6f37ea5487afc01a1ed4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme leveraging numerous low-reputation domains. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=fall+guys+ultimate+knockout+download+free+on+pc PDF link annotation
    • https://thingstodobahrain.net/ckfinder/userfiles/files/3173594954.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/48380806916.pdfIn PDF document text
    • https://premium-house.uz/images/file/rafiwipujob.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/97138386189.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/48019032731.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tekaxinize.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/xasanavereposelowibi.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/60079028378.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/2607345823.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kozurejazu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/pomojegowoxekuji.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/ladifakawusolegeweko.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/10672879514.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/81498777511.pdfIn PDF document text
    • http://hflchw.com/upload/file/75834955147.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161582e4242590---6550836706.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/gebubudo.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/juxufutowinedimamano.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091202320770554.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/kugulutosidida.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161323f1f7e8a2---mitalelanafava.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/mifudanuzi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 11332 bytes
SHA-256: 5ae6fc3d70ebada5739f3b2ddb80ffa185f379300363511c7829d46450d1d815
font_02_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 17096 bytes
SHA-256: 8fbdfc50def0636b8fed57aaaa6abaccad056900151be3e55ee994900c1abd21