Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d29ee5d5875c1b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-02 00:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2025422351f5592bf54d437ff3c14212 SHA-1: 136d68b624c24b1bd414e938d553a0c00eb2151f SHA-256: 42d29ee5d5875c1bf24406206651ecf47ad0f77f59b1cfd682e233e06bc5335c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://jottigo.ru/strik?utm_term=dell+optiplex+9020+all+in+one+i7+specs PDF link annotation
    • https://cdn.sqhk.co/kuretunaba/hbhhSaz/bovada_poker_app.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/165589.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/7150429.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/wuvepemujokomipopewusolo.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/pijzS4u/tibapivifu.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/g6gggeu/58094371354.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/how_to_write_on_a_file_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/XNiiieV/zekoxaxozezoxug.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/lefox.pdfIn PDF document text
    • http://dunotap.iblogger.org/has_have_had_worksheet_for_class_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/gauteng_weather_report.pdfIn PDF document text
    • http://pirubezufo.rf.gd/nebajanawelejakalupevul.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/ascus_formation_in_ascomycetes.pdfIn PDF document text
    • http://tunarijog.rf.gd/deposazapuzome.pdfIn PDF document text
    • http://lefazef.epizy.com/zoxibidomewotaluzodukapej.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/alien_swarm_pc.pdfIn PDF document text
    • http://dekixugo.epizy.com/95912175550.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/excel_countdown_date_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/algebra_1_linear_functions_worksheet_answers.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_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 5408 bytes
SHA-256: c80f9fbe65d23a0dd331bb52ffcc09f52867c86942f17c86dec74f0e02e3acbe
font_01_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 11388 bytes
SHA-256: ffd6fb263b0f62749b19a4b472adfd0a5911065909b9617bee86e33502ebd3ef

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