Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a626573dfba1dab…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 16:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20f58aa5c9b19269187c635e4a83009b SHA-1: f0128da98e9c3d6f9b281fedcae2d722fe89d6ff SHA-256: 0a626573dfba1dabbe78957f9bfb9f5a2f551e1fc7768a2f09703ef521e30392
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://monamifrance.com/FileData/ckfinder/files/20210908_13AC5C0513A2179E.pdf In PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/lizuv.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/66616483910.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/90954496720.pdfIn PDF document text
    • http://uchid.com/uploads/file/penigibekafuxow.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137890ee4613---77164245292.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0s8ihmvgqh8s09nkgpp555v0f9/zaloludebup.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48439518840.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bowefusipuzuse.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/33557992849.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/xisomixu.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/difapotut.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/40471424709.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tutixajifexepujuburorefu.pdfIn PDF document text
    • http://saydersan.com/firma/files/72886911455.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/kivuxunimapega.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/27921422859.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gogavewubirobu.pdfIn PDF document text
    • https://primer-spb.ru/files/files/vamusofatorufaroxelubuw.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/xukamareku.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/13003569823.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/kotuvavelixi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021121297860.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zusivaxijilomopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+charges+slowlyPDF 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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 17240 bytes
SHA-256: bb98043d62d23b5aaaf8ffaf066f4b046ee3115e245afffd16d101bab055e958
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 10732 bytes
SHA-256: 97fb7e22c0c8dbc6de0c7c7760c3a56601b3371911f9dd6378cde8f364856bb2

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