Malicious PDF — malware analysis report

Static analysis result for SHA-256 867c40b184531022…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 08:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4160c44c155136d8956c9baa73b0d904 SHA-1: ce46265945c60762c2630d5cdab79068c64235b6 SHA-256: 867c40b184531022dd1ca111f44ec76c33944c6cfc22e0f22c6d5f5b34802fda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating malicious downloads.

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://coretry.ru/uplcv?utm_term=android+app+to+block+hackers PDF link annotation
    • https://zhongzing.com/uploads/files/202109122106553823.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51dc0ce52---sejumuturavubiwo.pdfIn PDF document text
    • http://soles2walk.com/data/file/99613737680.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/pajinewadin.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/32673492442.pdfIn PDF document text
    • http://tradotel-riviera.com/file/daxevodidovivo.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210924020211.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/10402366308.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/getazuparu.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wexenawibovazidukojati.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/49648269645.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/72990488679.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/21163498708.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/puvazedujijekenenememuwo.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wibejagusifinamel.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/50392825974.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/42498334656.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/14422724849.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/10516671614.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/femomuzin.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/bowiwosomatop.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/bemixememajumolug.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/93531731506.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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 15100 bytes
SHA-256: 43ae8453acb14e3754b8f65663c75201630b4ad19d62dd4e7723d9b22af84d85
font_01_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 10824 bytes
SHA-256: bbdb589fc5f1bd84a666b9f18b65e1e5b94a94d66132b40a37ef65d1c6d21f0a
font_02_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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