Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4224a6ec81ff4f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 03:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1bae4acf6eea563c771b54a8dc1e9bbf SHA-1: 51cb73ab648765c9dc7dacc705ef419fdb871fee SHA-256: 4b4224a6ec81ff4fc7bb5f957085a8d96dcf6e4e8dce540d54c7d6a513e02c03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=mortal+watch+online PDF link annotation
    • https://speak82.com/_UploadFile/Images/file/femaluvawivirosulem.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/3453481553.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/25821276591.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/22066560782.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/90226327005.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/30197064275.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60463876639.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/24299172008.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixegiwikukikufawek.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewabovifisatedamanewara.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/56530362687.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/93581659546.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/54792701004.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/9739727597.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gaxivenurudisakerexetod.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/bubaxuwananupetejalejozur.pdfIn PDF document text
    • http://svx.su/ffile/file/zarebimibaselawivome.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/11931285333.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fotipajoselolezomomopa.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/87808940958.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/58447198728.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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 10240 bytes
SHA-256: d483304d9cffe9d6aa42d7831e3413f774a9784cf892345dae11b824c274111a
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 18068 bytes
SHA-256: eddde13ea87be1a3e0acafff5ee4e733452732d6d6d92ebb747282e0ac5ff3b9

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