Malicious PDF — malware analysis report

Static analysis result for SHA-256 25196f131e973b0a…

MALICIOUS

PDF

88.0 KB Created: 2021-10-07 22:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c46668d7ccbc4e35e95803ab1662ee28 SHA-1: 8267664360e6b44bc63a68b6fc61fb694885b650 SHA-256: 25196f131e973b0a01ea5acc89c5bed3ff0a4b7dfac81676db620eabab0ebfd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also includes numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://synerhu.ru/uplcv?utm_term=hbr+covalent+or+ionic PDF link annotation
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/38846112895.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/kifane.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/pamafipurigosupirenulitix.pdfIn PDF document text
    • https://bnovum.hu/downloads/velujipor.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140f37c5936b---rikup.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/9162875873.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/gureruzufusazig.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/43818947902.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/98592294544.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/vubutadupuluf.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/lesafulowaxufo.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/dupopawewuzotelobiwukejo.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-23-24-30-36.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/tafonozuzoseju.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/mizufezifuxewana.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/8c3d491f385ab0561fdc75cd0fe34896/xonigaxipizojibufawiri.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/89525341433.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/7790062034.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/81129309691.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/90465757557.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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 22416 bytes
SHA-256: d988cd6b27e27f537e116a767596b4b2d1b887325acad8a36f0bc53ef9def13f
font_01_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB3 10252 bytes
SHA-256: 9ff6ca3ba696f81edf92696bd209d337afc595c119dc902397648d99f2d866f6

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