Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da8213357aa2c12…

MALICIOUS

PDF

79.0 KB Created: 2021-10-24 12:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76bb19dac7e788bd8bc1a57de93e0ccf SHA-1: d38028706392293a94d6fbfa048f6cd38cc5c918 SHA-256: 1da8213357aa2c12fd79ef82ab7ecbd06c98ddb933509e17baee262fe630272c
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=permanent+alimony+and+maintenance PDF link annotation
    • https://pacificengineering.co/imagenes_cont/sitio/documentos/228022124.pdfIn PDF document text
    • https://stopserv.ru/files/file/toniwazutu.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/35125289220.pdfIn PDF document text
    • http://fedime.org/imagenes/pudamaso.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/fefuzavozadexoxetiropotis.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/29756604351.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/67789611370.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/temarexemusipumosuna.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/21543083615.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/lemekozujepusolipixokadev.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/furajekunap.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16156faa8056e3---12767577433.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/3b7ad834627fcfe6ff062fd723652581/82933741209.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/bovenidonagam.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/keduxi.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/27544033507.pdfIn PDF document text
    • https://ebooksweb.net/files/file/28451983909.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/72262988708.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/8193769490.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fokanijarajarinesok.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/47881059715.pdfIn PDF document text
    • http://schokozentrale.de/idata/budajut.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/juzefowezuteladuv.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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10476 bytes
SHA-256: 0ed22b5733e3a0dcb22c3c7dc031a0e6cb1358c8a228e1521650bd34a483ea24
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 17152 bytes
SHA-256: 00b61517ef8606adf8c70d165f36642889eff33776ea7ea84402cc055f8e494e

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