Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4837dcff24bdcb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 05:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e6aab6d5cad580d03ff4e7a1eb95e7e SHA-1: b37e4b3a46f4549099f85d2376ce3ac500efea45 SHA-256: 8e4837dcff24bdcb15617e8c1b4685e7be2dc3d9f3f784bedc47c6fdd63af3f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=starting+out+with+python+3rd+edition+solutions+pdf PDF link annotation
    • https://buonoantonio.it/userfiles/file/21385218646.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/8552012546.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mipifu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/17452976517.pdfIn PDF document text
    • https://ebooksweb.net/files/file/vexataxezuberonujunodo.pdfIn PDF document text
    • https://vpmemorial.net/images/file/77199959020.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/91383637563.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/lepizaserajogasew.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sokudis.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/81269457513.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130836d81b84---bujifumil.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/pafore.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/faxevejetamogar.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/85187078186.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/8219220802.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/49817675147.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vopev.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/98682251846.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210905191358.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/69862518673.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/nirafowazupigupuv.pdfIn PDF document text
    • http://zeci.nl/im/image/notot.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://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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 11324 bytes
SHA-256: 150574617cd63b8c234bc0d7cbe239a1fa785c89aef1bf4ba1d05618c011a72b
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 18936 bytes
SHA-256: fc8847e8098ea7b92c6ebd6f2cf227fc4a6bbf1c1f0278444b34419ee58edb27

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