Malicious PDF — malware analysis report

Static analysis result for SHA-256 3375b48bc99d46b7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 00:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 598fa4a832e93724de6c953f52a09f56 SHA-1: e2028cb0bdc1d4cf7dfc501dec1841828cb74c3a SHA-256: 3375b48bc99d46b79a1e2e2f8a66e88e14db6a3d99458927c31a8c2f54356f1d
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 or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=sao+2+episode+1 PDF link annotation
    • https://hsse.hssanesteban.cl/files/44361298571.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/a37df5cceae1c31574a48692017ca7ad.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/80533010498.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/zebafijapovatafo.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/75988545220.pdfIn PDF document text
    • http://freewest.at/12689583908.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zovokatekowadovaxunol.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/35589791161.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/59616276187.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/logupewefatoxiz.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/lolubozuzewefomuxovurix.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/jipewekuxufawewop.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/jajide.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/93924543923.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/xaduxudaferaferezimew.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/fiziguvofajezo.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jupofadukowijer.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/koruvagekovugixesi.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/voviwikogava.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/14454193087.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/wolukiroratunuv.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/judamunas.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kidixeguzenenoduvigazutu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/93546106338.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_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 16224 bytes
SHA-256: 3d6fb143de51ff5ac7217cb7d148e56ce5eb8d6e866060e7583a9f114ea9e92d
font_01_sfnt_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 10284 bytes
SHA-256: 9a7e6061c8afd6a0cfa88fc7fd76c000a50d77fb796ac9a808d6f2345f1f8a5c
font_02_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1