Malicious PDF — malware analysis report

Static analysis result for SHA-256 576d8c2583cede25…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 01:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a6eaff1fa994578c995a8833111f538 SHA-1: 00b7178ef81b4145a80b8df6b0d9f0872ca3d03c SHA-256: 576d8c2583cede25997f9d348e80f0b3dd06e240db1a5faadcde613127381960
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wildnaturetravel.com/File/naleguvexaziduwado.pdf In PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/54414880750.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/23039909484.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bivujumoreko.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/24147039325.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/25844255476.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/tekadafobegaxosomizewusas.pdfIn PDF document text
    • https://pokereshop.cz/data/file/xonojajikiwemipemigu.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/55996116078.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/gatakozaf.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/23782944918.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/24090440951.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/binupixovumivuvosarosaw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613022d627f5b---75273777074.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/78572855651.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/bewulatezumopabejevageta.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/86429530949.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/8681227165.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/58633631701.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/86253905714.pdfIn PDF document text
    • https://linardi.ru/files/file/33111752393.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/vekifobufofizi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85d96873---riregub.pdfIn PDF document text
    • https://tigapilar.com/upload/files/vilapajatijoxuladorazu.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/94353008973.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/46108162257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+shadow+fight+arenaPDF link annotation
    • 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_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 22944 bytes
SHA-256: 4f27ed5358e0214a005419e9c8c2dec98b38c4d0b55fe81ee4cc47edb2c96386
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10720 bytes
SHA-256: eb4ec41bbcdf309c89f5c0b6a7881cb54997dd93d267ae209942b650f77bdbfc
font_02_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1