Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eae55e44389cc6b…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 20:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008494e288e484fe4f8474280213e4cb SHA-1: ff2773a1db35e4628c3423398b383a9bc988befc SHA-256: 4eae55e44389cc6be2f2631f71c54a8424ae6a34518ead6b5ab1bb8afcf81709
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or redirects the user to malicious sites, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/domanobesez.pdf In PDF document text
    • http://alianzablue.com/aym_image/files/piwawenewoxelin.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/11096778740.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/kirimoguxinidumugovi.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/dajaxed.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/xifinuximikokonikegabufa.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/84021634298.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/jekuvimizuvabepegup.pdfIn PDF document text
    • https://nyig.com/files/file/70009213585.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t0bgeh31pva38oc5hp5dodqh65/lonenizuk.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nosilakaxorujijufa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/622696127.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9109af7f.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/juniwuvuju.pdfIn PDF document text
    • http://imi.vc/upload/files/dekaxusu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/velakumixelepafusig.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/rilezoneb.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/47236238468.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wuzubivomolesosove.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/jubaze.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pamitoxebibovivoxekurewa.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210926_101315.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/4966419721.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/sawovabisoradifoludasuveg.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/zebagu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/sopet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+websites+to+download+pdf+books+for+freePDF 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 16512 bytes
SHA-256: f8454c9a8e3a4839309f1803715e363ac343188f4e7341001af9d7e1ac7bc0d4
font_02_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 10864 bytes
SHA-256: 1a4a04faa2871c87c790ba565754b52e72155785262c9701fdc35013b888d318