Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae762e67bae707c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-12 10:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f58cf0b8a7fc07989bef825bc390c196 SHA-1: 4b4cf95225ea8b1a17b6634403c995a21dce07c4 SHA-256: 8ae762e67bae707cdc34b55e84d3d3ed21327ad0338b0b21b55c87b92c7085cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to external, potentially malicious sites, aligning with a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/82073855329.pdf In PDF document text
    • https://nevisnews.com/userfiles/15813239427.pdfIn PDF document text
    • http://wirheiraten.de/images/file/damibiwopujukafarejun.pdfIn PDF document text
    • http://firesystem.ro/imagini_ws/tolijedoweloji.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/13954757928.pdfIn PDF document text
    • http://soc-in.com/data/media/files/69101333045.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/43924098425.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/7676966034.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/55907233358.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/739499111.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/66099929499.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/bumigimijavelobemorojaja.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/46904953300.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9742a3713---sexegidokovudi.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631277871.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/zitafasatuxarudekone.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/84584223816.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59254056056.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/42620028066.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/35491097506.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/mufepebuperigisoviwese.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/xofipubogoranexubosipo.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/84144723694.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/doxukiradawavu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a0639375---11204093580.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/subuxijejegumiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+pe+download+iphonePDF link annotation
    • 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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 15044 bytes
SHA-256: 79575e32f62bedbb008e88b65b0fc359848dd053d03a947afa63503ddbb8bec0
font_01_sfnt_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10628 bytes
SHA-256: 4f7d4f3b6558a68593b5d8f20c2a1e5ebf4cb20aef5e5451f5c96e7f8dcd330a
font_02_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1