Malicious PDF — malware analysis report

Static analysis result for SHA-256 684e30201ae7a37d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 19:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce894652cfde0b25cca0469f8b5b211e SHA-1: 874e55d0d135c60e155e336ef03eae3d3f8fd833 SHA-256: 684e30201ae7a37d84dd62fd72538f8f0e21d758f0bb8afa48c67ae3ab04c93a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure malicious intent. Heuristics indicate a high likelihood of maliciousness, with ClamAV specifically flagging it as a 'Pdf.Phishing.Trojan'. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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://cplastik.cz/data/cms/file/11424857009.pdf In PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/tilidotifeku.pdfIn PDF document text
    • http://parfumland.sk/upl/53219678830.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/xenimofudumineba.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905060955.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dekarowizimerukozuwami.pdfIn PDF document text
    • http://kmsenior.org/file/files/nerarodezuwaxujibekoto.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/9405862663.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/61876458182.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/20466761778.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/rekiziriw.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/84645317993.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1665a9fe3635fc862542907612fa5c98/8619965395.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/9862120953.pdfIn PDF document text
    • http://cutskytools.com/d/files/73749291394.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/48265784614.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/77029507200.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613556f3481e5---vavixanumuruzogugu.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/14646915684.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/75234915017.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/jipixevazekekipe.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/tavoduzabemejelaxumat.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/3601236782.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/49339737930.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55208435440.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/lipokofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apk+the+king+of+fighters+2002+magic+plusPDF 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 11344 bytes
SHA-256: c5f08fc78ec75317127254551b08c775188f5429b5bc104f9a21812f6ab54a51
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 17592 bytes
SHA-256: 29f7845e6921666c5a520b22326e789447f51b69c7831769453a7232a0339358