Malicious PDF — malware analysis report

Static analysis result for SHA-256 2193e70c4eb14980…

MALICIOUS

PDF

78.5 KB Created: 2021-05-25 11:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 505eecaedabf93318c8cbc70ef929e5d SHA-1: 0f59b07e4bc3f46732025743b41770eec3038f3a SHA-256: 2193e70c4eb14980f8802a34233cab92f6f5445aaba4f0f85bbb751bad891e36
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('ponafet.ru') that is flagged as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=ejercicios+de+matem%25C3%25A1ticas+para+cuarto+grado+de+primaria+gratis PDF link annotation
    • https://nilarekatopa.weebly.com/uploads/1/3/1/1/131163832/2051572.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/bivamok-bugavuda-sojozunepe-lukexere.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/6992d7b92bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495254/normal_5feddca28d8a5.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/tirimexujedotakowipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fcd5126e6368.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/balapadelejananodul.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/kezakafijojeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_6048c7ea3a759.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/jilera.pdfIn PDF document text
    • https://vavirewafikeja.weebly.com/uploads/1/3/4/4/134402836/tikagunakuxetesi.pdfIn PDF document text
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/zolenipasas_xalonekidij.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/gonafoziguwewe/fantaisie_impromptu_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8efd0b-db34-43eb-a375-cc167430574d/senolovamadofe.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/kidde_firex_heat_alarm_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/suunto_ambit_restart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3829b4b-71a2-402d-92e3-f3fe37d50d2e/gukixawusilurozagomom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f21a5f-c15e-44d2-82a5-8061c722db7d/how_to_reset_check_engine_light_chevy_silverado_2011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c70260e-daa6-406e-bb06-0f19e44ac5aa/can_google_home_play_music_on_my_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/windows_10_enterprise_activation_toolkit_2._2.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/norma_aisi_316.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/decision_tree_classifier_logistic_regression.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 5628 bytes
SHA-256: 3479bd3561ab3ada2959ae54e57355fd557d72023ed680305bc026dc6837f4cc
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 11788 bytes
SHA-256: 211eed70779a714eaf8b5362dcd6aab34fc4cbedf57542be4ee78ba5ad62e327
font_02_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 16124 bytes
SHA-256: 073dee480399a0a44f59834a72d2ef372219071628d3787cc95d902351e1adc0