Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de349996f01dc91…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 20:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b132020c954cd7286b645f0901f159aa SHA-1: b7c4626612fc9429c2b9430bbe753967c32f40e4 SHA-256: 8de349996f01dc9178ea066558ad2397c56cc50621c96849a8f87d048c496b81
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to obscure the true destination. No scripts were extracted, but the sheer volume of suspicious links suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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=keyboard+sony+apk PDF link annotation
    • http://dinskayarealty.ru/media/file/vubokafawaxeradapevaw.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/jaropetukewitefub.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/14435588351.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/37413f71d818360393d9cf618ba00728/viwiwebonigik.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/keluzezeda.pdfIn PDF document text
    • http://kelsenator.com/userimages/45363217399.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/03lcrgigja03ke37k0af31r0u1/juduridibenusikaki.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_5449CD32985E3890.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vosevakivokuxesigefer.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/50843981672.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/xajepamamorelufuxerosum.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/29515942900.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/delijuso.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/59870820676.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/lodowar.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/44688683267.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/fuwisinafanu.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/77510870019.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/97781422003.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/96580619213.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/22785348087.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/17703502617.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_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 18336 bytes
SHA-256: 5ece4323d593ff870b76b277c6ddf3aea706d64390a8786849d8bd961979674b
font_01_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 10488 bytes
SHA-256: 26de7ea7d0f8d3ddad1d9d909432ebc31a95738b5527f812e243dddaf7ebef1a
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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