Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ff1b8c73ab9e63…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 15:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33493694c0d3243c539dd59633b1338f SHA-1: deb7dd82c70526e80237c9c4e8997a459e542580 SHA-256: 47ff1b8c73ab9e630d32a67b9248fa6e06b9d20d955750a021e4f39e693787c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous unknown URLs were extracted, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://canphantich.net/Images_upload/files/gagorefofi.pdf In PDF document text
    • http://educasters.co/ckfinder/userfiles/files/20383841009.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/83044832357.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/72061791608.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/3916464560.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109061103541264.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/85509169637.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zuvimesiduvemo.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/93069520068.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/nuzafomenur.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/nurisawidonesurawapifi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5280ff5b---ruzowesunigovenekolupibum.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/lusegasuwegisosaj.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/66353500740.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/fozujo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53259478830.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/genewarorudododod.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/revuduzetoluf.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/sijixujirujezidop.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gigulisojizurezebumagudun.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/2622927733.pdfIn PDF document text
    • http://espokebar.com/uploads/files/61074942074.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/lugepofenetagijewowemana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=text+android+to+iphonePDF 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_off0000ba7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7B 10340 bytes
SHA-256: c7ebb9bfa67c6785b3384799ab839c8c1fe3dc3d95131e68c70714347bfb7f4e
font_01_sfnt_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16424 bytes
SHA-256: 7b5112a44cdc3423a916bbdc6ce3f985125cb4be9375ed0d461f0f7b1df109d8
font_02_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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