Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c78fd8b3b153d91…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 09:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e941ca45c548434906eb75e470e07dae SHA-1: 4805dcfe08dc6c13205e1970880033619583f9f2 SHA-256: 3c78fd8b3b153d91bca007697547771cf2e3366391f6a71d9e7ee24cc82c51f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=djm+rec+for+android PDF link annotation
    • http://studioriboldi.eu/userfiles/files/mipediwuriwuzaxomukusek.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f4eb72986263588ad831265a5ca1de6f/51752169945.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/xisit.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/6794350260.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/52786091958.pdfIn PDF document text
    • http://ailizia.com/userfiles/17003316217.pdfIn PDF document text
    • http://princeverma.in/uploads/files/84071493657.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/47492404503.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/dizunitilodobe.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/panawukigufajunajegunaf.pdfIn PDF document text
    • http://klemanpince.hu/files/file/17571001783.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/97832949285.pdfIn PDF document text
    • http://prota.ru/upload/files/nezezafujaworironefuja.pdfIn PDF document text
    • https://alutat.com/data/file/vugokirelekejozeton.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/juvevufupajojezazu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134afa5c1bd8---17229562395.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/mivasogikolarogunobom.pdfIn PDF document text
    • http://lagrupacio.cat/file/64470562239.pdfIn PDF document text
    • http://lex.tj/img/file/33041162450.pdfIn PDF document text
    • http://sro52.ru/uploads/files/nemoxavitesifenofadena.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/41164390152.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_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 17736 bytes
SHA-256: cf7fbae474694d25da6333aff2532896b89ab4df4973088c2fce5f9be449c607
font_02_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10456 bytes
SHA-256: 35b936d33a5ec3a289d787770eb3a13befd2259a40ba21c972df6fde058867b1

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