Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60feef76e3c825d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 13:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cd993ac4d9e58705a37a944caff9e94e SHA-1: 185cac9c5f43747fa53f4d57e028e43fff3aafaa SHA-256: b60feef76e3c825da35801bf179b63b126aa3b12b5c40877abff24682772850e
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 of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=bangla+dictionary+offline+apk PDF link annotation
    • http://stamforgtechnologies.com/uploads/30607860631.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/6965205308.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/kapuberatedufogimadosaxaw.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zuxezepadukep.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/38426144588.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/muxomuvakejunufona.pdfIn PDF document text
    • http://a-pluset.com/userfiles/lepojodidolipetozaxifuv.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/vatazakasawunem.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/58028238533.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vimakojaxexifuvo.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/xenosagegipagufijawizidi.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kefowulonitosikama.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136466943ed9---kesituwotabatemuji.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/xasatowulesuworajazefa.pdfIn PDF document text
    • http://webbuilders.com/files/file/18945512607.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/joralipifazaxowogebun.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/16692131552.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/sadibevudiv.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902160514.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/47171653308.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mewuvimujipusapuro.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/9618572085.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/97153357005.pdfIn PDF document text
    • http://ihdbd.org/upload/files/68146098059.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/penavijonodubozotimezu.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/valaxawibutojuxafojuzimem.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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10888 bytes
SHA-256: 24fc77f55da45cb0a3fa3ff685199cf533d64a7a82967f2ab0779077e9c42a5b
font_02_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 19932 bytes
SHA-256: d8895acf6f35feb0795e7ba1894cb8fe0e2b2ea70fa4183582e248187b67ea8d