Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ed48e793cb7641…

MALICIOUS

PDF

82.5 KB Created: 2021-10-06 22:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: abb4f03783875829b2ff2ee8c6702ddd SHA-1: abcf0c1cd86bcd838f1d0a47b855e179b23e74af SHA-256: b4ed48e793cb76418c877697d9262757288c3908f8702518333b055913a6d379
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 hosted on 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 0.9974

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://smidgel.ru/uplcv?utm_term=how+to+find+minecraft+treasure+map PDF link annotation
    • http://gabortech.com/admin/file/wokunezanufevosip.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109170155381711.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/40781111397.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/vazosoku.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/tiwan.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/besanudam.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109281144434340.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/51663683897.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/11561986659.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7e141717b---fotanej.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/63454248670.pdfIn PDF document text
    • https://paperland.bg/uploads/file/77993827900.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/miwaf.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109240701303078.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/50208696466.pdfIn PDF document text
    • https://somogyplusz.hu/files/givus.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nodonezixumuxulilewij.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jetatimotazufixusefi.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20050758869.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161339bee57705---balomabiderefudoduvuv.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/rubaxusugogojuzukidigaxa.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/88969003268.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/51350780282.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/13725653206140413f1a4e5.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910090715569342.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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 19096 bytes
SHA-256: 5161460f6abab2fbc0041355c3b7711357f8cbcc349da758da77e49b464b516d
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 10912 bytes
SHA-256: f0cff72a4e591a952d35edc3507ae4a2109634ecc7ccd009e100e6b6a7589d43
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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