Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76d0dc04583ab35…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 08:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 501b6b12572872be1b868f1b5efd77a7 SHA-1: 58406c013cbf58ef741db8e8e50a0ed856af75c1 SHA-256: e76d0dc04583ab35917f1009d4be93dcf0a9a4c001ceed6e01cef747db95ebbd
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sky1981.com/asset/uploads/files/88733795706.pdf In PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/56934955378.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/61791316538.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613314352d9b1---vugisetizemepazalexamav.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/tilut.pdfIn PDF document text
    • http://cl-pub.com/files/files/dujedamigip.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/49438004716.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/18979567159.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/rolaje.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/totewexodad.pdfIn PDF document text
    • http://mdtrend.hu/files/file/rewarumulupu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/22773810418.pdfIn PDF document text
    • http://atek-ent.com/upload/file/mosizunafapadabow.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pomosege.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fa05ada9---37476593244.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/rulevijomuteneguro.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/sedemekesideburo.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/32297323939.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/84823551196.pdfIn PDF document text
    • http://kasargod.net/uploads/file/panik.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/jemudofasamepap.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/ruvalisavanalej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=universal+android+aio+flasher+toolPDF 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_off0000b4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10524 bytes
SHA-256: 3de9ecf88ee69b92bbdcb7ceae48bc88b9fcf2d09f28b7a50011073ebb869ea8
font_02_sfnt_off0000e4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 17036 bytes
SHA-256: f39db6bf7d14b660cd6526abcbe125ba408b15ddfe2679835f2296ec9509446a

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