Malicious PDF — malware analysis report

Static analysis result for SHA-256 738d16b24ac5e62e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 06:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b9abe629f20a89e3ee4d7ed037d7e44 SHA-1: 4212a0aa55df53ae6730b121aef74ffa6f687578 SHA-256: 738d16b24ac5e62ebaae269b0f07eed060a5cbff7437684168757a5bc242e61c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document contains numerous links pointing to different domains, suggesting an attempt to obscure malicious intent or distribute various payloads. While no scripts were directly extracted, the presence of numerous URLs and the link farm nature of the document strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://blfimmobiliare.com/userfiles/files/potizixabovu.pdf In PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/25869116978.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/9968042982.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/vulerimoverunavo.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/33630038600.pdfIn PDF document text
    • http://wernitznigg.at/files/nodesi.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/tizozogexodokopubokagesof.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/98892713086.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/35263213716.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/31607004898.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/dekatekipupukigago.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/23419657820.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb4006423---tubosasoz.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/vibiwurogiwa.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/15292645756.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/lepugotakadevonoxavek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kuch+kuch+hota+hai+full+movie+download+mp4PDF 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_off0000d12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 21388 bytes
SHA-256: 964d7ef32f80757013d7fc8d4ed1ce106355a88a3379346f41d039656ad3b2d8
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 11028 bytes
SHA-256: 145f90537ec104feaf13b95d163804eb20c39b8c30cf9f85ec61fab96b742824

Open this report in the interactive analyzer, or submit your own file for analysis.