Malicious PDF — malware analysis report

Static analysis result for SHA-256 f098cedd524a42ba…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 20:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1dacf000173583daaa2d14408b1e77e SHA-1: 112329efe6ca364289f7c9c7fc4fffebf430597d SHA-256: f098cedd524a42ba785c04ee53539553391617670f24f8d935e24b9e68f47871
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=7+apk+mod PDF link annotation
    • http://autovoda.ru/upload/files/49114482688.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/3e3d6e21081b98a9a912c54a93c60b9d.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/duvumodatu.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xebarunefezodisetoziru.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140383354793---4941054177.pdfIn PDF document text
    • https://andreivieru.com/ckfinder/userfiles/files/18407246514.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/39382003240.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/8510230899.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/sanew.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/55697951996.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jagezoxi.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fazexowimegolatusitekuri.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/92856704774.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfe1c6746---73836601547.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/serijeximosizate.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/40406733852.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/40311429570.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/mafeluki.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/godewavajuvumar.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/11497415438.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/naxexikenewe.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dutagotagifum.pdfIn PDF document text
    • http://congtyvima.com/images/Download/kavafuxisuburesulevi.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/7448374218.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 9856 bytes
SHA-256: 1662d884e70fd34cb5af919b776d84dcd07183b8d721d9521e3162f65a4a60d4
font_01_sfnt_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 14680 bytes
SHA-256: 4d0d6275e6bd310416ac04e516e9506c07c8ead2ec2e121e940d0becfd7d5b4e