Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e53b0daacae8c8b…

MALICIOUS

PDF

116.2 KB Created: 2021-04-04 05:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01c0fa097afa444e84671bf070c705a0 SHA-1: b38067090be79efa01943f27e4e395f9c677e636 SHA-256: 8e53b0daacae8c8b70d4ff2761da8a6f18e93e47d387d9f4f3991b1960f2aa84
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. 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 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=international+women%2527s+brass+conference PDF link annotation
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/549236.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/30943344239.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/5660697.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/3649528462.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/rules_of_the_game_summary_sparknotes.pdfIn PDF document text
    • http://bisewilorilamej.sportsontheweb.net/mengubah_file_ke_jpg_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b087eaff-c1a1-4b05-8e03-1044a1f019ce/are_there_words_to_moonlight_sonata.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/zobomiwugoluwetorixanibux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049a4aad-37db-4459-9e42-bc43d2bed689/5835496413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f151d7d-cf74-42b4-ae27-8b466f073bc6/adobe_premiere_pro_cc_2019_free_download_softonic_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc9820a-350f-479a-b416-3de00a232517/64465116471.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/73495111516.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/diagrama_bioclimatico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a952576-f8fc-4356-b23c-67ac3fcf77b3/vesed.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/tibifigegudowukaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b9e01e-0491-4e0d-af21-40888122b8ef/zalaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79809702-997b-4487-b84c-98e9baa2a5a4/hp_laserjet_m1536dnf_mfp_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/93911924766.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/numerologia_tantrica_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c88f9d-f597-4407-b2aa-0aed983906f9/durijepevodajaminet.pdfIn PDF document text
    • http://tirigofov.atwebpages.com/gda_building_bye_laws_2020.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/66173522373.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_off00018d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D09 5232 bytes
SHA-256: 2089eb4c5282335beff0d2ff1e83665c7194707bd48105e0c72818221dcc62ac
font_01_sfnt_off00019ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED6 10544 bytes
SHA-256: 0290f5cddcd6be7911d41565739d2b40075bb2cdea67527c14af8fa945cf47aa