Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2c05d55848acb1…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 20:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 19bbae9b2c3bd8e0b73110b1cbf17a97 SHA-1: 5ba33efd9d0e0793b03b114b26c6e5aba0d0b6c9 SHA-256: 4b2c05d55848acb172417fb083eec26e0e641a340dba4433894ba5735958877e
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=the+guns+of+august+pdf+free+download PDF link annotation
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/tupim.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/fetunalub.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/norofujomusaw.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/29033838970.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/bozoledesunega.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wajafod.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/mudiraxime.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/60988610601.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/pujuzifun.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pulati.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14005233315.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/60216711529.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/fetewujali.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/mamen.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/67440956976.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/46963067126.pdfIn PDF document text
    • https://ksboutlet.com/file/files/42732504664.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/3757955678.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/zuxofuruleli.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/27653091286.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/ponorebix.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/firinigarenizedupudef.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_off0000ad42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 10836 bytes
SHA-256: f1d3971fd6a90f85c141178c9670b14256d23885c03f925d4a9a4dd7a4f8655f
font_02_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 15956 bytes
SHA-256: 25aa05aa6d6ec90a3c7dbf0a493710e1b741d05a3f185b399f5e97df91970567

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