Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a9537326e40856…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 03:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0854adc52c30d29ab074b1d5947d125 SHA-1: 24e42417084059880c5d09bdc15e0718e8df3fcd SHA-256: 39a9537326e408568052dc7348383658ab6cfa7c690d23b458ca108540b1de02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://healthywithhart.com/res/file/pefuxagetoxababibusanox.pdf In PDF document text
    • http://mopron.ru/upload/files/52203836002.pdfIn PDF document text
    • https://ratosatu.com/contents/files/83912232676.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/9898709973.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/73708568766.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/13815291832.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/pifatawofofokivumuz.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/4198515542.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxazetopilufuniririna.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/12011166271.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/14244810739.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/befonafe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d8f524f71---92223333299.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84926821161.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/wamagu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/5290275806.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/49302027925.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/99036059007.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109080436554975.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a944f4d1e5256e6af82ec7aba3068091/wizaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hill+climb+racing+2+free+vip+apk+downloadPDF 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_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 17860 bytes
SHA-256: f8e36ed5e91322266094f0cf4f2060ba676399c741df46884ad6e4196ae46509
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 11192 bytes
SHA-256: 65af523bd50d31b849fed50ef85e8cc558bc4518fc1f96b85195d4ce18724992
font_02_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.