Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e239e49022ffbea…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 01:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d1aac371c7a6efeb98f40c54b4595cc SHA-1: 6d17318728683ac12c204c304a4b8828b9084cf3 SHA-256: 4e239e49022ffbeaa438bc32a22f24fa55197a0681bf22da3eb5d8f0139e3991
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous external URIs and is structured as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external resources, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ip-pharma.net/data/files/dexogulozedezurojixiza.pdf In PDF document text
    • http://fields-on-earth.com/images/blog/file/43019294498.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/mezotuxuzogi.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/78160789248.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dipuzaveditewupimetonibu.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nikusi.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/95383999763.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/vagavupumuboseraboxafow.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jirutovafobe.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/89664015266.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/talix.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/67463541597.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/83443624308.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/gupugeno.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/kaxitenukabu.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/38436869664.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/podusavo.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/tizokoditiwizarulowo.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/32220281565.pdfIn PDF document text
    • http://didopack.com/files/83983339649.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfda52fe---xozomaderejiwuk.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/zasosug.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/kalopofawenukuginosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hooked+inc+freePDF 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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 14496 bytes
SHA-256: 6bbffac2d77e3f131d499dccded559d6e348780d1e3437d8ab3cbc0d42d1bb3e
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10080 bytes
SHA-256: 4cc1ae7c6e9bdced6b54754d932841b56d45759ae2df5c9c2ea3d13e3c77055e