Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d413397223d818…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 19:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: d01badf1cb6f08851259ee2bf74a2ea7 SHA-1: c3eb4c1cc39b890e912f2a0f0d71912608d6018c SHA-256: 96d413397223d81893131d5d452d2138590cc20039421497ce5479743d73191f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a large number of links hosted on disposable domains, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=great+by+choice+jim+collins+pdf PDF link annotation
    • http://decaldankinh.net/upload/files/zusajabijitisixojofizedoz.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109171452104059.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/86332325075.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/71229299529.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/vunovexodejokux.pdfIn PDF document text
    • http://jawarakreasi.com/file/93852462818.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/vaguvikulekexusapax.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/54591601750.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d1cb3851c---lomosisuriputib.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/jezivoxadax.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/kupejowefidiximepax.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/mezelefovifamabisaxame.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/41018126489.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/76890595785.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/gepopazegav.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/78421375047.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/9795647125.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/53935333271.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/fokuxidigakijerumejupam.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/vomuwikurew.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090415272633.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_off0000ad2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2F 16544 bytes
SHA-256: d62b54193a5084adcc15e6dc6b538963b794d8669ea5bbff62140d1a492f02c0
font_01_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 11308 bytes
SHA-256: ab655c1b20a3f1d4db2d7297b6c2d70261fda016ac9a8610064e846b670e51b0
font_02_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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