Malicious PDF — malware analysis report

Static analysis result for SHA-256 221a512d46e0953f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 12:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34fde07f80ac56d324a18ec746bc1e66 SHA-1: 2be0f3baa9ab37932fccf7191a74340e00ddf23c SHA-256: 221a512d46e0953f89b7dca1186aa3d1acec23e32ecccbfb13bb9a9a42f4e7ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://keongracun.org/contents/files/80883829193.pdf In PDF document text
    • http://kbchina.de/upload/43103315560.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/wukonajifemujesipif.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/xaberobudavumujudozuvowij.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/10393468330.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ecd9d6ae---pagirowolibadugev.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeca690f43---28268816680.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fd921f1a---15150720688.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/jepisejagux.pdfIn PDF document text
    • http://vecsecity.info/editor_up/lotizi.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/sugudatem.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/11473579664.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/13999037011.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/53071606969.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/75546765131.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/39149842601.pdfIn PDF document text
    • http://dongphat.net/upload/files/78417329821.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/guwafabogex.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/72089413746.pdfIn PDF document text
    • https://12shio3.com/contents/files/vazotufiliz.pdfIn PDF document text
    • http://herve-coiffure.ci/files/18391893546.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/jivikegow.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lorulag.pdfIn PDF document text
    • http://arucax.am/user_images/file/58611673768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=new+nigerian+songsPDF 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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10204 bytes
SHA-256: 5604f731e5ccb68b5b8347a34410e7680ef7de3c847fc7b7b5ffcfd4a5dafea4
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 18508 bytes
SHA-256: a16e104403688c2d0c62e6bd94532f7431f0c9568c75efe1a2e9e0b745d68bf7

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