Malicious PDF — malware analysis report

Static analysis result for SHA-256 038e6c267b5c75e8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 05:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58bde498703f939de3dd38b4b836e893 SHA-1: e1a8d1a173978b88186d918fa864b4d573dc5fd8 SHA-256: 038e6c267b5c75e8595bb7818da1ff71fa5c07078e6371344335a9ddf012aa02
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with several pointing to suspicious domains hosting PDF files, suggesting a link farm or distribution point. The presence of 'LOLBin token sequence in document text' and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this PDF is part of a malicious operation, likely involving SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134bed04ffb6---manofosawisozuroter.pdf In PDF document text
    • http://khangvietdn.com/uploads/file/wanowamosuvunemifuteroda.pdfIn PDF document text
    • http://geotersrl.it/file/gozutikuta.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/42633671679.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/faloxopelunerawuni.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/6802756875.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/zexuber.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/53055394935.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kalewomatefojojomukev.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caa14f12e---vulakav.pdfIn PDF document text
    • http://ibb-online.ru/f/file/51078192602.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/39099108335.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/bobabedafoxexo.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210831_200344.pdfIn PDF document text
    • http://afslab.asia/upload/files/60842231134.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wokiwewagejubebidujen.pdfIn PDF document text
    • http://jarosi.hu/files/file/paxomoselukixajiso.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/pulikinufoxenovusa.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/31287915027.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/satowasetotiv.pdfIn macro / runtime command snippet
    • https://baxsporthorses.nl/userfiles/file/83335084085.pdfIn PDF document text
    • http://unseretochter.com/images/file/varegosejutebud.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gonajasig.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091152563119.pdfIn PDF document text
    • http://mazdooradIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=don+quixote+pdf+english+downloadPDF 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_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 11112 bytes
SHA-256: 90acba77468e1822b5e74b1863a489e8b27d1e3c111a800ed11b5223b2bc3000
font_01_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 18224 bytes
SHA-256: 7475e59c227df59dde6dac655cdefc72a5fd4498666345289c3e8015b95f1da7

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