Malicious PDF — malware analysis report

Static analysis result for SHA-256 932408cec8876d60…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 07:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e194f1a988f50100de7325a2b43ea57c SHA-1: ba08466aeb5f1c1dbc6ff9fdf1315e823d10ec0b SHA-256: 932408cec8876d60607e7c866678c3c17986e008d31b5916f158f862e931d35d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for redirecting users. No scripts were extracted, but the overall pattern suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=word+starts+with+e+ends+with+e PDF link annotation
    • https://yodobashi-church.com/kedusitisatinixajapera.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zepitibojitanoj.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/98307835087.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/40677320374.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xuzuvodijal.pdfPDF link annotation
    • http://miraesusan.com/ckupload/files/jufajonufasowilasezexotan.pdfIn PDF document text
    • https://people11people.com/uploads/File/lusegetowodivu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9d2d714e---nizezazopo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/lasevusikulir.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rukuduso.pdfIn PDF document text
    • http://metapolar.hu/tmp/3846302009.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/95028289883.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/mevapotupetofaruxebexexo.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/wobegudimofalakesuwasib.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/91846779653.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8g7v228g9i3b6bp80anmag0il4/17327901552.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/fizasujep.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630959188.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/36075989626.pdfIn PDF document text
    • https://motoralbini.it/files/file/dezosagi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/52938561684.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/napanosapekokod.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/zowedofixafesajenofixobam.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/81697860940.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/jogiloluluweg.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903225327717.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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 16536 bytes
SHA-256: df350a9f0ed726c6edd9605954580bd6853dcc5560e291980cb750f3fa938cb6
font_02_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10380 bytes
SHA-256: 52c53b455be8c03aab1b5148abeae3ca4e80e7dbef35c6c49fb0f3325d76bb06