Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddb6b01864a82a1…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 05:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01c2d48b824c8b4b2f92f22b864f5b62 SHA-1: e3f4014631ce871311f611d222fcf534340cf5fc SHA-256: 1ddb6b01864a82a1aab221f13ba6b157da4d74d4221a84d2ddb0bb13debde715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The document body was unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alpasol.e-giant.net/upload/files/lugawotirara.pdf In PDF document text
    • http://wxdyzs.com/userfiles/files/2225435478.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210905_191908.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kogugilagul.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/94731442540.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/21521069322.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/22471704706.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/61740062442.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/xonog.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/71047832650.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/vodutu.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/35519800176.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/71032079688.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/piledajiliralukadajizoz.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/lagelumipabomudef.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/ruzulapexad.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://vas-vill.hu/userfiles/file/34205426840.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/6326836367.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xuwivevigapetexajajakotis.pdfIn PDF document text
    • http://lg-palette.com/upload/files/tesozodamimapaxuparaf.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/29671335710.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/vozarexino.pdfIn PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc4dc7550---85619250925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=monopoly+game+apk+modPDF 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_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 17360 bytes
SHA-256: 8d5cd3d5da033dc3c05f1d6e51ff06d42abfda8f757659ab263a52de9044e5a6
font_02_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10476 bytes
SHA-256: 75d144bb931cfbe993712fff1c953dfa581d8a4e0cfc2acef74f58b938af1648