Malicious PDF — malware analysis report

Static analysis result for SHA-256 c812a186c6f43401…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 18:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9719e4883037bbcadf15a6517a8db2f3 SHA-1: 0191e66763e22058bc0c8ddeb0c1e988870dbc04 SHA-256: c812a186c6f434015ce9e1a1758c42cde45f10d238123ab82f926b46e1ea8472
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous links to external websites, many of which are hosted on potentially disposable domains. The primary purpose appears to be directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://hearing-outlet.com/uploads/files/202109100643136172.pdf In PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/85863502890.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/26444229630.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/4376038380.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kojogaped.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090400481373499.pdfIn PDF document text
    • https://wrd13.com/force/file/kunujufowod.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/52940734782.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/ruvunogojefesavaf.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/xowepuwuboridolebanafob.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/leduwopasepove.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_082609.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/48578025635.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5323943c---2143418900.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/daxixilejiv.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/fasujisesi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rewobuzoredavugemipuwe.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/fexoteku.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/gamudurobawiges.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/84785173749.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/8538934759.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/lutigeruxisajarukofun.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/puvesixopedukekaluke.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161305b29aecc1---98306750984.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gufira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+android+games+of+2020PDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 17664 bytes
SHA-256: 8aabcb67ed4265be69643cda09539c0e8a990e3dc51107aef57c594579d79388
font_02_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 10944 bytes
SHA-256: 4d72efaae4195784c61ecca6ab4c8a8cef32aae9cbf98429ec87b166dd415961