Malicious PDF — malware analysis report

Static analysis result for SHA-256 90acac297853ce35…

MALICIOUS

PDF

93.6 KB Created: 2021-02-28 10:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c590d3378e354b4e59fefcd493010b1a SHA-1: d7fcb75258335676de4b870340c16e24e231420c SHA-256: 90acac297853ce35189ac9aab78360582d2167d0e2450e461d6aa20cba86681a
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The presence of multiple external URIs indicates an attempt to redirect the user to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=frases+de+colorin+colorado+este+cuento+aun+no+se+ha+acabado PDF link annotation
    • http://fasodotujane.iblogger.org/ios_emulator_for_mac.pdfIn PDF document text
    • http://degimoto.22web.org/45592971201.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/bujezova.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/bafejabifoxirapepijekopuz.pdfIn PDF document text
    • http://jetelijunejuk.iblogger.org/jujuvo.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/dulenenumitizirorex.pdfIn PDF document text
    • http://dovogonusiru.iblogger.org/jaroxopuk.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/85520577120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelukinig.rf.gd/29313781826.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/officejet_pro_8620_printer.pdfIn PDF document text
    • http://rupeguv.epizy.com/63745267326.pdfIn PDF document text
    • http://sulorunak.rf.gd/gawobekatowe.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/25520347386.pdfIn PDF document text
    • http://pujumek.myartsonline.com/25188277233.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/stock_aluminum_sheet_metal_thickness.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/45484346522.pdfIn PDF document text
    • http://pezidojixu.rf.gd/what_oil_does_a_2016_toyota_corolla_use.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/kgf_amma_theme_music_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/speedfan_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/zorodisevikiwanebuvufon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 5124 bytes
SHA-256: ec8764138144a8a8a65161312a45953aa0a20c14062b491c2fdeeb462d97cf39
font_01_sfnt_off0001421f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 11696 bytes
SHA-256: ed1556bd17de9b79696f2228d5e1791d69be09f62ddbea0a3d543f0b6941746c

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