Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98e37629486c6ab…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 01:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a0ecf50a0c42c4e594f54bcb7387d4b5 SHA-1: 7c8b8e39c89ad133083174227526c75f402d2d36 SHA-256: f98e37629486c6ab51cd860285e2fd35fe381685fa7ba53af1ce899fa4a85a36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using many distinct, disposable hosts for links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=conductive+learning+definition PDF link annotation
    • https://aymexco.ro/ckfinder/userfiles/files/jakune.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wexifemivor.pdfIn PDF document text
    • https://felicityokolo.com/file/15119267913.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/76534268932.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/gexazinavawuvonolabos.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/numajebuxilizedukosak.pdfIn PDF document text
    • http://samtle.net/ckupload/files/zoxawigewuberegujaruxuxu.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/10420994935.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f1fqmt1cg2ht7tqgvjb5hc2ugs/80995001872.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/vugasar.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/sufolegarulena.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/90970341895.pdfIn PDF document text
    • http://sgpeo.pl/users/file/80098135517.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/20035946310.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/31581610417.pdfIn PDF document text
    • http://attlas.center/userfiles/file/vebiraguwuwunivek.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e527be7929f677cdd437b4f0841e417c/kotibe.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/duvikagelumufidusosuvug.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kamitufuremikupozi.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/75718139717.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdfIn PDF document text
    • http://esen.life/userfiles/file/43515666264.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/11429558508.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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 10680 bytes
SHA-256: c2e37128551098bc4dd29bf85366b24fca0e02e95bc7a2c4572cd71ebfd5e49d
font_02_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16812 bytes
SHA-256: f088e43709e08627707a92bf0f94b026d85d04c4e314b042f1d2f5e6e89d02df

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