Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2336d764733fe6d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bfcbfdba6ce71ae87b0b2db9bf0d182 SHA-1: 28c92b0a145eb167c7a7cdf5dba4aa689cfae3e9 SHA-256: c2336d764733fe6d289f990a2a13d511a62366a0925beed7fec7379b8deedc1a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to exploit PDF vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 http://softtox.pl/new/userfiles/file/49306117589.pdf In PDF document text
    • http://dinhviht.com/images/newtech/files/75443240479.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/bajurodu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/wamera.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/91820291850.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/dinirugikatifaf.pdfIn PDF document text
    • http://katachizu.com/img/news/files/tonenex.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/74877719363.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/49293976026.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/lotiberilufi.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/nowubimuv.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/51757471449.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/fepokuzusizotixadulugafub.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/78235501237.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a176b69fd---xotitufaxukimawiv.pdfIn PDF document text
    • http://toroisg.com/public/images/files/47231145549.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/36420725279.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/32341882794.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab66d3f3bf---relogasafudifuxobaw.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/30244462452.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/48384044074.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/galofakenomuxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+download+of+tortora+book+of+anatomy+and+physiologyPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/somixuxososaboru.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_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 11244 bytes
SHA-256: ab8b23f5eeb7e4318d0ad716d79c1afe57dc767cce7f5d7ef70f43b32a1916c3
font_01_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 17336 bytes
SHA-256: c3600044ddf38e8a736cfdeadbabb96e852338fe0f3ced9950ca4318e7bbdbf8

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