Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cce3517c593a830…

MALICIOUS

PDF

77.6 KB Created: 2021-02-18 22:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dcc66e6c15706b2abca1c376f2916cd5 SHA-1: 39a937df5381b7f6ceb4e8db0fff53507855e3b5 SHA-256: 5cce3517c593a83089c8049e53784eb6dfb8dcd83f68f7ef4c515595efee1a54
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially malicious content.

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://maypoin.ru/123?utm_term=a+christmas+carol+movies+1984 PDF link annotation
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/300eeb0c7f4168.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/5676924.pdfIn PDF document text
    • http://kuxixepiral.22web.org/jokaj.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/009d6ed.pdfIn PDF document text
    • http://liginirudusupob.22web.org/articles_of_incorporation_template_ga.pdfIn PDF document text
    • https://pevapulef.weebly.com/uploads/1/3/5/9/135979240/mefixogifanen-milulinunivun-revuvirekiza.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/jbchbjb/flip_knife_battle_scarred_safari_mesh.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/cercle_de_la_forme_saint_lazare_planning.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/3139497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maligufaribez.epizy.com/borexubumeraxodagabufiko.pdfIn PDF document text
    • http://kepinud.rf.gd/calculator_free_on_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/nomezesebafudar.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/71730966557.pdfIn PDF document text
    • http://jenulozamaberur.epizy.com/la_cicala_e_la_formica_piquemal_testo.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/doperuxogotome.pdfIn PDF document text
    • http://kinapemib.rf.gd/mind_mapping_ppt_template.pdfIn PDF document text
    • http://dekuroveki.rf.gd/81125965695.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/7367464442.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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 5580 bytes
SHA-256: 2d4423a37d2d30393f92a576113f3d228c286909c76954055ef061d36ccfe95c
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10636 bytes
SHA-256: ff5f4602dfd44cfcb39bdbb239611f8ac101c966df4bf7696f805a49af68fa73

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