Malicious PDF — malware analysis report

Static analysis result for SHA-256 8909c882f4494e45…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 04:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8be4a45e8576422a1e9e36b485a1ccbc SHA-1: ffc67dbdeb9016b5013bed1149eea744c522e0f5 SHA-256: 8909c882f4494e4510e9f390d88400513027c069684d4f58d946280e44095cad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with numerous embedded URLs pointing to disposable domains. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the primary goal is to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/78360017477.pdf In PDF document text
    • http://photopuzzle.net/userData/board/file/9148679765.pdfIn PDF document text
    • http://unsersohn.com/images/file/90148063154.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bimejunuwosumaliji.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/84773733051.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/55846935844.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/milam.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/29585475684.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b53eb12---72704534667.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/31517816475.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/kidoleworurowuxutilufubul.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/vigimowefusewifatedotu.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kewefexozigemezugusobe.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/97375665794.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/zobupa.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zigib.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/gutadi.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/28030227378.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/11433077597.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/30262446199.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/2697839229.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cotttg4pv0kp9or07qhq0450fi/beboriruwipozuj.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/812654916.pdfIn PDF document text
    • http://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/72138040607.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/98497698012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=my+story+hack+apkPDF 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_off0000c5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 10296 bytes
SHA-256: 181dc6f254f9d9033f03482694f15ce9583f959ff353de17f67e012ed893f9ff
font_02_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 16984 bytes
SHA-256: 96624398af8c8e1ca9106b121ec7fcf7f3c2db781e80027ade675bd0c845e534