Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f856e6f482930ee…

MALICIOUS

PDF

89.9 KB Created: 2021-09-23 02:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 706a1eae891c4edc1802bbc366ea342f SHA-1: 35d5ae3b17c3f6864cb44fdda0bf79c4a7ef7c83 SHA-256: 3f856e6f482930ee1a17f0be76cd552e562ef5ec649a9c28a2804809f571f27f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and is structured as a link farm, with many distinct hosts and UTM parameters, suggesting an attempt to direct users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://queure.ru/uplcv?utm_term=pirates+of+the+caribbean+tamilyogi PDF link annotation
    • https://xn--atpta-nfb.lv/images/userfiles/files/38449865394.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3421122c7---fajuluvogexodebo.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/zujevezuneti.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/wavabab.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/poxumibin.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/83535462722.pdfIn PDF document text
    • http://arucax.am/user_images/file/64750578261.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/10988378264.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/bedopawefagipatowiv.pdfIn PDF document text
    • http://humanlitech.com/files/files/sakilupoz.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/63859305006.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/77679100828.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7801914100.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/pejovekatekedolajijogifi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xakumebemukezedudosaxo.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/09052651258.pdfIn PDF document text
    • https://servicepapik.ro/files/5168989160.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/27869632759.pdfIn PDF document text
    • http://offerparts.com/upload/files/rofemumatabugasal.pdfIn PDF document text
    • https://dance-lab-new-delhi.com/userfiles/file/tulotuvogujulo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc359e77f---38839860355.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/zubuku.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/46061913465.pdfIn PDF document text
    • http://coumert.com/images/file/kazekaju.pdfIn PDF document text
    • https://andhimazhai.com/images/files/85082730073.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/jamoromilokurivaz.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_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 20464 bytes
SHA-256: ffaee734c3e6a261d4891ddcd7cecec91ec8c2e49ba5159d756d2c666be03d7f
font_01_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 11036 bytes
SHA-256: 778c83797493006e11632281319bc581a4e1c7b238e11e1726c3ea2f68623374
font_02_sfnt_off00014171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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