Malicious PDF — malware analysis report

Static analysis result for SHA-256 3935bae1a923a877…

MALICIOUS

PDF

97.6 KB Created: 2021-09-22 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88b502a9034c299655ec8c7ecbb41758 SHA-1: a0c7b1d2bde772407a0555e4eec0ef73392cb8ca SHA-256: 3935bae1a923a8777ea85afc03e61191bcd8a1c839c84122dbc3a38da4cfd298
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://priscar.com/documents/files/kivikesimep.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/sifejidakibibonufonu.pdf
    • https://landtop.com/filespath/files/20210916191801.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/wafozeji.pdf
    • https://osiindia.org/ckfinder/userfiles/files/40026010088.pdf
    • http://dsagco.com/Upload/file/wivoxaxufetogid.pdf
    • https://neksav.com/upload/ckfinder/files/patuxunevegilodomowirixif.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/42866091605.pdf
    • http://ruishikaishi.com/upload/content/files/2021/09/20210903025044.pdf
    • http://www.kickcommerce.com/userfiles/file/30869210374.pdf
    • http://ruihuitax.com/files/file/1235061654.pdf
    • http://sanzmendia.com/userfiles/files/sodeluzevi.pdf
    • http://clevio.biz/fckUpload/file/gewigexuxevutuwibita.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613789e5f08a5---keroxikimonorede.pdf
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/lufupetovopidibemurel.pdf
    • https://syteq-pro.com/userfiles/file/25958871308.pdf
    • https://mobilaide.com/upload/editor/file/51848045173.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210921_222207.pdf
    • http://aan.kz/ckfinder/userfiles/files/tegodagemarilizifogu.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/28206207735.pdf
    • https://feltshoe.com/userfiles/file/99659538700.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=new+movies+you+can+stream
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a6a.bin
f525878a8106e9009027d38cbb209528c80be8e69518f71a16dfd84fe8b2d736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 17756 bytes
font_01_sfnt_off00014876.bin
bd84ca6d4824f7010ff156bb5c7c0dd60ddb9a0f98a2f953d22f32999f9f2d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14876 10688 bytes
font_02_sfnt_off00016119.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16119 16792 bytes

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