Malicious PDF — malware analysis report

Static analysis result for SHA-256 8949f4b73b001867…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 09:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05815fd18c4d409299ad3668b296b661 SHA-1: b6ee766cb0f459d884b0ea892b050746f47641ee SHA-256: 8949f4b73b00186739a2c7866bbf57bbc4434a99bd7a2ad811afa0dd683b4c99
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and is identified as a link farm, suggesting it's designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=mi+settings+apk PDF link annotation
    • http://chapelguild.com/images/usr/58618284867.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907194709922.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/24780076631.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///45358632720.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/17057815686130a3e5f1de4.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gerupewugagedepiwelukufe.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/gowigalexatulerideguxuka.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41b981719---telapexazejokeruzojuw.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed07cad34---24690673930.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/64556595366.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905042722922.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/sulepevuxu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/59368232542.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109030936309413.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/sivepuradabinafixe.pdfIn PDF document text
    • https://businesslife.com/content/file/88393599029.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210904/files/20210904010044.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/20886972265.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/55823965799.pdfIn PDF document text
    • http://klenderbio.com/upload/files/44114481004.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/28552188705.pdfIn PDF document text
    • https://flomogroup.com/upload/files/33612166092.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/kovixomipipepi.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_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 10248 bytes
SHA-256: 9f7d57f8be6ac4bebc559a21b8649d0869909f5854ab8424b0492a7e97e296af
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 17304 bytes
SHA-256: c1931fc152d2053c203cc727ae631a8a7a2f51034daddd9e3ef9e72b7d8020d8

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