Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34492a0dcb5c9a1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 21:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0406559434a74e5ed01d8b3f20598016 SHA-1: a15821a7eac0acceecf7f46e781706d4c0160991 SHA-256: c34492a0dcb5c9a1ffae8bbb8681c2fdfe48b7e5827f09d52444b6f1ed36f18a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f0a385b7---42162940408.pdf In PDF document text
    • https://anhhuynoithat.com/asset/files/vemaxukunivirilosiw.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/64872282737.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/78033957455.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/jibuwipapo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/25087945251.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/38543883553.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/69519367737.pdfIn PDF document text
    • https://macronew.com/upload/files/78843326118.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/damefasesubifovuzisikuz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/053691da8e80c1cb7648ec4024ed5a9b/wasesosaramoruge.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/71449147744.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/65559477358.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/66822190208.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_48946DE87F85C5F4.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/fugomezedanenamusemifumam.pdfIn PDF document text
    • http://japhina.com/upload/file/40141818474.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/16453721707.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/31692404733.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/norubitepunalatimixam.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rebigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gamer9v9+gta+5+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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10564 bytes
SHA-256: 2e3cbcb37c148b15eb8750219e73ed2dd53e345aba71c90d8bc2e8cf24dd1ebf
font_02_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 18264 bytes
SHA-256: 9a14707321cc92af70918e6a11d6084a35a670316a36642e11235aaf4ad9553b

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