Malicious PDF — malware analysis report

Static analysis result for SHA-256 15557b55b29e57bb…

MALICIOUS

PDF

88.4 KB Created: 2021-05-14 22:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81220898c80626853080eb2dbc715d32 SHA-1: da7a41b2deff3fe49c48b001ac7a47c7d8b9c237 SHA-256: 15557b55b29e57bbbf5ce295e180e8e5299291eed61914c7be5d94394e0fa1c5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gorasanoso.weebly.com/uploads/1/3/1/8/131859135/pagonegelewimi.pdf.
  • 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://leonvi.ru/strik?utm_term=dante%2527s+inferno+canto+19+full+text PDF link annotation
    • https://gorasanoso.weebly.com/uploads/1/3/1/8/131859135/pagonegelewimi.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/52904003817.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/best_selling_romantic_novels_download.pdfIn PDF document text
    • http://muwusus.iblogger.org/free_download_tailoring_books_in_urdu.pdfIn PDF document text
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/zaritexalosisul-rafavimoz-pimuro.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/bar_louie_menu.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/doxig_xetakoxipeja_gafubuno_dalakozig.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/jujovuzelurivuja.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/wiwibileponore.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/24120477752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitikatul.rf.gd/43638879393.pdfIn PDF document text
    • http://dujepuxa.rf.gd/free_validity_sensor_software.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/list_the_5_relationships_of_confucian.pdfIn PDF document text
    • http://bopijugixuxum.epizy.com/8826205472.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/56228812507.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/how_to_write_an_opinion_essay_on_a_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/91096983645.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/girobozage.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/5539235314.pdfIn PDF document text
    • http://suxuxuned.epizy.com/netflix_movies_pc_windows_10.pdfIn PDF document text
    • http://wamigorudazuz.epizy.com/43133621062.pdfIn PDF document text
    • http://kusogit.rf.gd/xegiwititejukudotexogorud.pdfIn PDF document text
    • http://jopununonigemo.epizy.com/90006889463.pdfIn PDF document text
    • http://divepirat.epizy.com/puruwafuguvavodedovaberi.pdfIn PDF document text
    • http://gefilodeza.myartsonline.com/netbeans_tutorial_tutorialspoint.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_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 5184 bytes
SHA-256: 3d2c63c214d112e682aaf12a0ae8edcd31ffc7af5d0f889c4dcb35ae8874b5c0
font_01_sfnt_off00012d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 12144 bytes
SHA-256: aaf74573238c8c607a12e5d49c4dd75e9389df8d5596c988b85c859eeec52894