Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a32188e9178e04…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 04:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f786e4386ed7e9b8d8385529723e5fc3 SHA-1: a230afd4367ec76e051038e28f15559ed9653e0f SHA-256: 92a32188e9178e04102241f8d4f0d934d284d4140c06e58d7b46641e57dc17bc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous PDF_URI firings, which are often used in phishing campaigns or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=net+meter+apk PDF link annotation
    • https://dichocungtoi.com/userfiles/file/zidedinisezir.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/98626008409.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/xutadalavozoga.pdfIn PDF document text
    • https://mackbeks.com/files/file/zegedipevop.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/69889965619.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/govuruzevuxu.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/18758584126.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/birawirewuwamazuju.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/majavorakopexagakolekik.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/sukamonirol.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/31022371725.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/71671286757.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/potidunujine.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/86290644220.pdfIn PDF document text
    • https://btegypt.com/file/mugawu.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/49767358711.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/wipibutadozib.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161309d0c84f39---lupiwopedute.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/duxivewufam.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/23950013120.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631113551_520ff3dfcf.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/4091192500.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/3675740972.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/paren.pdfIn PDF document text
    • https://adikketiga.com/contents/files/82423410868.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/75794581208.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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 9952 bytes
SHA-256: bafb4ce02e5eec83912870da2199d51ffb83057c643f871f0628cc872ad774d7
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 18372 bytes
SHA-256: bc5754560e654c0246b50bda6ab6923f36e6366c965c067fcab2743b6011bbb8
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1