Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6b872a4dbe529d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 04:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3e0fc98ea788593e64c6dd69b2e27c5 SHA-1: e681b45bd4152e60397aea20be79042129f9cdfe SHA-256: 9b6b872a4dbe529de405bd6735eae844352d74d9a17e020f0932e7f740f13ff1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URL points to a domain associated with a link farm, and the presence of external URIs suggests an attempt to redirect the user. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://atcotourismtravel.com/userfiles/file/vumorovugobasukajinog.pdf In PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210909095556.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/tizibibijugumogawinepa.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/31021161369.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081200361348.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/nigazi.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kizepi.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/60398404384.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/75878260661.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/fawar.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nazabelidafuxuv.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/wovojazaxef.pdfIn PDF document text
    • http://khocabien.com/uploads/files/xirunokiduruvedev.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109162042315240.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddd8e60b---kozurujorasiguz.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/dopituxesa.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/barotazonifidofilakebapil.pdfIn PDF document text
    • http://master-vin.ru/files/file/9370159120.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/16253110073.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/48560208595.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/pumetapalabogo.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/75310444812.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/jamapitaxavijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ae+cc+crackPDF 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_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 18360 bytes
SHA-256: 7f8f9885b885724418bc1e361e3e2c70b806bc06d1c505730360efd7b334b5a3
font_02_sfnt_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 9668 bytes
SHA-256: e2d255fdae3813155ed972c2a54e04f229fbea500370b9acb26dcbb3f9a40048

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