Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed7dbac9b384962…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 10:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8cecfe8462c351ba8bc270cd98d274aa SHA-1: d58f8f87e4969e5cc9e476a1ec68b0c2098914df SHA-256: 7ed7dbac9b384962c057afb26ee73abcf0c712872daee737a70f7e60f2d44ccd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a probable phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host numerous links on potentially untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://landtop.com/filespath/files/20210914050236.pdf In PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/23480827887.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/jiwefituzibazotesasa.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/lulokavinivilelefozeka.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/26384652696.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614564f76f519---nobinogatarilap.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/bamarefepadanoso.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/zikizobaturu.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/sowifokas.pdfIn PDF document text
    • http://dakov.hu/_user/file/lizekoz.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/kafidevigumik.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/jowet.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pinogajalesufunibariti.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/133476254.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/gebonusuv.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/11587534724.pdfIn PDF document text
    • https://megashina24.ru/files/files/dokozuzenup.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tadafopa.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/14165234758.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/sorefijopefusanaxuxu.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/govolokuvixenom.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xebekobozimesesitosubomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=screen+size+android+appPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10500 bytes
SHA-256: dad3bbea6aa03d637992a8a913a7180e37691048976cc428a53eca12d7d21b06
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 17276 bytes
SHA-256: 2480aede37ec86dfcda8c3d7700bf5a1b9bdc2d1c6ebdf47b5ed4cd397b4e5b9

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