Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf7c09d5f24dd1b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 17:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cb75288036a953f55a0388aa5be797a SHA-1: ffa237cce111cef9ffc11287918a54bb55bcf718 SHA-256: dbf7c09d5f24dd1bb83a5067dd782af12f6ab687f856dd2c2b521b57da85aefd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for phishing or to distribute further malware. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=careplex+vitals+app+android PDF link annotation
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/mofolesesuvika.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zijafiwokatetepa.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/vosewif.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/jakevoniluxigarakafiben.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/86313547628.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/54933892967.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/58861358952.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/wenisakosaga.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/pepexidefukuku.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/takifasunasakino.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/xebitowadaz.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/bamujowomovalazagewew.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/64876121442.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/zufumukurujekuduru.pdfIn PDF document text
    • https://premiersuli.hu/files/files/46932240080.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e403b21deb---38477673356.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/14557162931.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/tixaxo.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kuxed.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82902882492.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4fb402751debcbe78212c5e83f7c3bbb/68604713045.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/49700711372.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/89478071583.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://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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 10584 bytes
SHA-256: f3d84a8e6959582ebbd6badf04c959a4c88fd69988e9e592f050b51ecc82c8d9
font_01_sfnt_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 15012 bytes
SHA-256: cb0d3d76c7750104ca05b263fb2964b1d9259404c34a6d7c1f8dc22c3d45a5ba

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