Malicious PDF — malware analysis report

Static analysis result for SHA-256 660895f440daf334…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 14:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f7b1ddddcb4bff3e0f7aeb8b4b7857e SHA-1: 6b2f2c93f6e120039d5bf5206932f4a3665c3588 SHA-256: 660895f440daf334e19c85a939146e8b0a3fbf3099e4af2b0b193cd17389a7e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially compromised or malicious domains, suggesting an attempt to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's structure is designed to host many links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/varewiwinitagifexe.pdf In PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/56334957303.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/4276650869.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/23432092525.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/zizujajibolefosokezalezu.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/84501621155.pdfIn PDF document text
    • http://apcmagon.com/userfiles/jovifadaxosiki.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/29681166602.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/ralurogiwasavize.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/teduninubezebegewemu.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kuvir.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85463182719.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/74768830715.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca8943284---1632795998.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/jofepivapam.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/fodazikoz.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/1048823604.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/sojuwagewi.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/97285913426.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/perijifawebinowikisefira.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/34121112089.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109130346167598.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72c427440---vepuvogarebuzevigowu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/95852163632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+improve+my+data+connectionPDF 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_off0000bcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEF 10716 bytes
SHA-256: c33123723e3c3227084f14d74518b1adaff55706ed0049768423b5e6b4ef4ca1
font_01_sfnt_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16888 bytes
SHA-256: 617f624056b9bdea2b72695821f79036f62ad4db3e82cdab8326a175a3e335c3