Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda8110c2f1ad95e…

MALICIOUS

PDF

86.1 KB Created: 2021-03-06 04:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: baae77ab777acb91826178c618cf13a1 SHA-1: fc2fbc18664a0a60e8addfbc14b1a173a736d34a SHA-256: cda8110c2f1ad95eb46babf2dd96e345a36c49b7b1c4c233d8206e28d3a176f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=tascam+dp-006+reverb PDF link annotation
    • https://cdn.sqhk.co/sitopizol/gfaFwOL/fish_liver_oil_is_rich_in_vitamin_c.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/tumamiwu.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/kukelinuninug.pdfIn PDF document text
    • http://philonio.online/certificado_de_origen_estados_unidos9thw4.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/hi5hiak/tufujefaseroputawukobeta.pdfIn PDF document text
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/8b0f48a1049.pdfIn PDF document text
    • https://malizopal.weebly.com/uploads/1/3/5/9/135962708/3bdc8.pdfIn PDF document text
    • http://gidpopiteru.com/macmillan_readers_test_answers8ad2x.pdfIn PDF document text
    • http://biwonomapul.iblogger.org/keurig_b31_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xusikeko/tjcP9jh/2870585635.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/pupodusojujuxiri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://surobufalinaxis.epizy.com/resume_format_for_beautician_fresher.pdfIn PDF document text
    • http://nedabiworada.rf.gd/45732681938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3526b5-635a-409b-92df-91e4c3a2cdc3/reading_ruud_serial_number.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/material_safety_data_sheet_isopropyl_alcohol_91.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9608dfc4-f0b6-4a1f-a057-608fe100b620/84593780849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dc0bc7-5152-4d78-a8e7-b7c27834bc3a/45875444032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171a7d1d-7658-4b1a-8c84-037d12d8fb66/63272336274.pdfIn PDF document text
    • http://badivisixeg.epizy.com/livineko.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 5108 bytes
SHA-256: df7396a03196f157955dd1b4af074aed226eaa64bc458afa76563806d4147c5e
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 11568 bytes
SHA-256: 99f7f65a125b0c1b55c21a9c20a5df3d61fd26cd665162262bcb55914757269e
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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