Malicious PDF — malware analysis report

Static analysis result for SHA-256 8015a0390235e5a3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 01:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd0ac96b2410f71c399ee74a7e3001a4 SHA-1: f54ce708000c088f69e37f40450feb503b39b65a SHA-256: 8015a0390235e5a313280c7198c1478b738a725667172b6f766972ac88bacf05
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, including one identified as a link farm on disposable hosting, suggest the primary purpose is to redirect users to potentially harmful websites. The file's structure and the presence of JavaScript point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://relaxzenter.com/uploads/files/42555268260.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4e873895---51661472242.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/xotuxumomasomebufopep.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210917034326.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/78463934383.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/10970648659.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///nuxuxekuti.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/tobabivom.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161398c25716e4---27644323380.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/putaxupinukeverozudatitof.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/jedodavujogazixe.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/72198398351.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/10042492977.pdfIn PDF document text
    • https://reniuved.it/file/dudebuwitugesaw.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/nukumisuramipuratoba.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/31063475055.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88508226635.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/8035523254.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/10623871095.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/zivopivepusopona.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/nunedik.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910230429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=welcome+to+the+rileys+full+movie+123moviesPDF 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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 18308 bytes
SHA-256: 39ece82cd926cb31fb94db7ec261326610551fce8c8b7bc2e12d847cebed2039
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 10952 bytes
SHA-256: 77b5d59e0ae2ffd8162242fe615f5a61f2b278cca0ed2fbd25949e8c00983ef9
font_02_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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