Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3fa01428d72ad6…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 20:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50ea7d38e7b1af58095188d3ece5d3aa SHA-1: 15ad4cf4152191e2a6620e13b59bec9bd4b75231 SHA-256: 1e3fa01428d72ad670b79a4d2caed379866d22e8eff6595fb2e2241cca027edc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pbchistoryonline.org/uploads/file/lojawenuwifomojugego.pdf In PDF document text
    • http://debnine.net/UserFiles/File/83753256648.pdfIn PDF document text
    • https://rintrans.com/files/lelibonom.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/31585790735.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908162647.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/wopomexubafuzel.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xigegogo.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/degaxuva.pdfIn PDF document text
    • http://huefpdf.org/upload/file/nogupefovenarorosabeta.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba49849c2c6ac2577ab871b347c552a5/saximaxike.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/jokajopezetajono.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/simimanotupuku.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7cc875aef7a72008142debdeafb47b15/81042703573.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/42399150229.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/suxutevolerojepo.pdfIn PDF document text
    • http://net-marketing.hu/images/files/lufifavusolejemat.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/86266690497.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/83284174822.pdfIn PDF document text
    • https://rippa.pt/files/file/10948662521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+dls+21+coinsPDF 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_off0000bec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC6 18480 bytes
SHA-256: feffa1c2d4af89e84868986489bbdeef3cb4d8377ce240aad661c1bcde75cd3d
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10288 bytes
SHA-256: 7746f7b4954b3966a583c9c606ff90fa48f85fa983ba34332bf653f4e1ffebb4
font_02_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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