Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe0289ccb497871…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 15:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef5866da6cbcfd5bf2300d5b4b72a1c4 SHA-1: 83f3a34577f8c5fc1bf79a49852d21070ffb8e31 SHA-256: 6fe0289ccb497871662966111da24f527d0a99e3fcc1ae5cb2da11b64ec1938a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=schedule+that+deals+with+official+languages+of+india PDF link annotation
    • http://epmachine.ru/d/files/mobabiwe.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/17412548871.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/luwiwixejinugejofujew.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/35556797499.pdfIn PDF document text
    • http://enricobarraco.com/files/36438123147.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/welesufiw.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/68793178259.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/89691352340.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/88455450052.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/63961549877.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lobisesixofuxibewe.pdfIn PDF document text
    • https://dalba.net/other_files/File/6361442682.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mekezifavifixep.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/2501845212.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/zexogawew.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/zazox.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210912120655.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613866ab1b796---nabukevagixurudatovojorik.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/mizivuzekajamij.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/25261908770.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/86405441133.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b057468c1c0eab1c9173556e257d4500/retikobilikegi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/59586567772.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 10916 bytes
SHA-256: d87a92b98f3412debd9cd08056326d857cbfa0c7fdd340a8c50d3215e100e08c
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 18352 bytes
SHA-256: a3051d43dec0d4212ad8193c8b2e405fb7d6a535cf9421e6b6e41c5bc7e67e2b
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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