Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31e0a555821e1fa…

MALICIOUS

PDF

79.5 KB Created: 2021-10-10 04:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 935cc4b58c2b6886763950a3b15d6c90 SHA-1: 28749058c954aaae3a89c8ddc3413d39b15388fd SHA-256: c31e0a555821e1fad15c4faaccfaf7054d9d25545d0d7f4fd09dc62219a936d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://kennycojewelry.com/userfiles/files/202109/1632912695.pdf In PDF document text
    • http://mathrainbow.com/userfiles/file/59601784911.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/nazobunoxopuxetuda.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/vupibebiviwapojoreb.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/10925657735.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xorerewizazegewajuteja.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/masifejavegakewevebumu.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16617024428.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/77798969715.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/97946791109.pdfIn PDF document text
    • http://sksound.com/userfiles/file/tadejetizomef.pdfIn PDF document text
    • http://baoveantam.org/upload/files/71199999855.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/mozatebexazi.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/bimevimizop.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/watakezum.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210927152451.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jogalari.pdfIn PDF document text
    • http://simonide.org/userfiles/file/33782416582.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516d3630519---fusabekapavuguwe.pdfIn PDF document text
    • https://naukriguru.com/php/uploads/file/55798247769.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wuvarisubebino.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/muxarorenupow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=family+fishing+weekendPDF 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_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 18888 bytes
SHA-256: a4672c66b696fa8a5076f6cb8bde2504b6187b8004ca1447eb1cdba83190a566
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10752 bytes
SHA-256: f6169c2a2de1afd937cd0d939cc104c302ac8a87955f54c081120f540b858e49
font_02_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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