Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd898feb94977028…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 02:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1e897ffcede09106298e8a20a99820c SHA-1: 34c30c6719518e20c6182a7eccda48d62474fc84 SHA-256: cd898feb949770284abf6633e4e08ba369cbbc51041f88792b49a9cf6ed72278
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The presence of embedded JavaScript (PDF_JS) strongly suggests an attempt to execute malicious code within the PDF. This script likely redirects the user to external URLs, as indicated by the PDF_URI heuristic and the numerous extracted URLs, which are characteristic of phishing or malware distribution campaigns. The file's structure and the nature of the heuristics point towards a phishing attack delivered as a document attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aisne.proximeo.com/ckfinder/userfiles/files/berik.pdf In PDF document text
    • http://ipublicity.cz/data/file/36928208488.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/70017798204.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613140cce1b64---zujanurozawaxa.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/gufobinapavefun.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/tufigumisilijesi.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/89229356963.pdfIn PDF document text
    • http://identik.hu/editor_up/wavazujokilakujose.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/94019602393.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/27198827506.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/12195832802.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/dotugadu.pdfIn PDF document text
    • http://methese.com/upload/files/408038481.pdfIn PDF document text
    • http://sivam.pl/files/file/wataxufe.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/turizife.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70249311540.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/55414971125.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/zaxasetiwekojo.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/43027498260.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lomijijozuzofosifot.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/924892541.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/99471399730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vibration+test+androidPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 17916 bytes
SHA-256: b25a7c8a8e4fd089f56c806dfb9f61309c68bb390cefc1f499163045df7e8b76
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 10304 bytes
SHA-256: 8ea1126b24a4283009af9a7aabfdb6c934f43cd8aaf4c0edef83ec2228c1198a
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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