Malicious PDF — malware analysis report

Static analysis result for SHA-256 584ca944ae2c63e2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 07:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f8188e408e9dbc1852f13a792b7576a SHA-1: ab1ce3e02505dd55a1637f81fa4c97c8fc1d8b3b SHA-256: 584ca944ae2c63e2cfeab330a5ac404b62709831eedf4edbe6d0d0afa536d7e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to other PDF files hosted on potentially disposable domains. This suggests a phishing or content-luring scheme designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gursakaryahukuk.com/images/file/kirakikaxadurizupozo.pdf In PDF document text
    • https://rajakedua.com/contents/files/97797759568.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/sabasufet.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/87727754282.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/9147637442.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c63e142b1---13022301055.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vowiluxepegitomuvisezo.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/7093283972.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/jirebobeka.pdfIn PDF document text
    • http://cssh.es/img/file/nifodivamabimujaxiveze.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/89348663466.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/39009645227.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/78157800297.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/gujiraseg.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/tedawovoki.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/ziwagevizusoneduvat.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/midedisowejimudejo.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/soporajelelutusovudetov.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/dujalabevexabojupux.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/xavewan.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/26949859218.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sesililopiwazebe.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/72594938687.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/mipuvuziwozuvafifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=taxi+sim+2020+unlimited+money+apkPDF 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_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 17060 bytes
SHA-256: 184782d8d0cbf043448d902f63d22e40461f353ec4492882e2793fd5e16ca459
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 11068 bytes
SHA-256: 3726c143d37f6cc6275bb59c6cea30d7fe5215c5d8c54881ace3710be1dbcd04
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1