Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41064e0a85bc19c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 15:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62895a72ec587d1584958440b09cbbac SHA-1: c56ca260ea34ed602c2acba2587a6f9e6688928b SHA-256: b41064e0a85bc19c05712459b60b6d07cc211e53689302614d2243ca4f6a36f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting an attempt to redirect the user. The PDF structure and embedded content are consistent with a phishing lure or a downloader for further malicious payloads.

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://infrive.ru/uplcv?utm_term=lista+de+aplicaciones+que+se+pueden+borrar+android+samsung PDF link annotation
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/dajorobaxazisanin.pdfIn PDF document text
    • https://shinaltd.ru/images/file/96128612337.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/15382435852.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/metokuninirenivomu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/22208741300.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/37795916647.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/91622788738.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/75843537843.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/vagirinoz.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/60892209784.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/suxurivom.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/jimeginagisag.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/jagufapa.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/desekurobelosetaxipu.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/rutotipaturu.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/mobedakonugazofunifu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/17770943245.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b8843264---kekopafazufiw.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/natobodogijawawom.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/60828066686.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pefusofevenil.pdfIn PDF document text
    • http://snft.ro/media/file/36564297310.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/44562672652.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/53895263094.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34221599342.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/97832949285.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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 11200 bytes
SHA-256: 9cadfd7101c1e34be4ea66f8591b0f8d281f194fb99cf9e9e4d98f67e3f0dfc1
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BC 18504 bytes
SHA-256: e4ffa060e90a1cedd00e18f1e311a87b57f4ed55862929284910e3ec37a68226