Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba66d88af1fd803f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 21:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46e44a9141e702dae386a2a7c201373a SHA-1: 74a2be029f9a021206db170e47176ab18f8d524f SHA-256: ba66d88af1fd803f176df477cd9c5e74b2ccbfe374ccea8807d839091960bc3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://unionnutritech.com/upload/files/55113669437.pdf In PDF document text
    • http://techscreening.com/userfiles/files/48865737929.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/ralodenonidujaxajebujir.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/mewumutepos.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109080352038248.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/jetopevebalararikurip.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2792b9f8ca2f2eb3618df10ef6f8f569/1817246102.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/tukuvetositat.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/43688133872.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/tefopigifirefov.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/95906335163.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/48829412071.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210907180318.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/94508396050.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/lewixudorodurerete.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/88527054337.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a96c433a1---54948645252.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/51462061595.pdfIn PDF document text
    • http://espokebar.com/uploads/files/migenovibop.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/13994846104.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/95435759448.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/jogivopazelowofesutumi.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/85925253124.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/59781232941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=likee+mod+apk+without+watermarkPDF 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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 17248 bytes
SHA-256: 10e8e779a460355aca4fc961aa1554490aad92545ebb8d12c07d16de1463b428
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10576 bytes
SHA-256: a6a8ed173d50d7475081c9c40de118cb8eac89884e3a7445d49586de70986a52
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1