Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4b18eea3a775c2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 06:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ef77f8ff5fcf1d1d075a6a57bb707c8 SHA-1: 5a246e87978e3eaf47ff50109e189ac4922693c6 SHA-256: 3b4b18eea3a775c2d7c1415fd50fd781c69b2a96e436e447d53aa5cb15dba4dc
134 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The embedded JavaScript likely redirects the user to external URLs, such as 'https://irlanc.ru/uplcv?utm_term=fake+message+apk', which are often used for phishing or distributing further malware. The PDF also exhibits characteristics of a link farm, suggesting a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://irlanc.ru/uplcv?utm_term=fake+message+apk PDF link annotation
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/25198466629.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f156b5a67c---85075916113.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/tagugeroregejudaxaleveba.pdfIn PDF document text
    • http://jawarakreasi.com/file/fomofagate.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/retili.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/joxawu.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/nufon.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/8356766309.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/90623359610.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/tarinilezafaguwoparibalu.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56144175105.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/47261701048.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/suxibu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26504702722.pdfIn PDF document text
    • https://argumentua.com/i/file/96903790653.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/32860238229.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/53165422160.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/50439393916.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/puzijubusobividalu.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/94838623733.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/vilagefexadotiwatabadoni.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc5040650---17940982279.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_off0000b96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96E 16576 bytes
SHA-256: cc2b83833a335586a56bf7375c104410e94e9dd0217e63f4fa903b1a91c458e5
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10104 bytes
SHA-256: 4c713f8a4d5dafe3b4c56786dfaa9c1ac38ddecc31b218c7f3f83a1eaa8126fb

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