Malicious PDF — malware analysis report

Static analysis result for SHA-256 b797785c1ce5635b…

MALICIOUS

PDF

109.1 KB Created: 2021-05-05 18:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8fb1f31f388f20d94e834083d4fdc967 SHA-1: 4843f35711af56efeb11d28512519ec9b75ed130 SHA-256: b797785c1ce5635b8b5c4b2abe66f0437708992f74227fa9d763347d6a0b6882
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest a phishing attempt to lure users to external sites for further exploitation.

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=python+climate+data+analysis+tools PDF link annotation
    • http://pewodebepefawi.scienceontheweb.net/aditivos_para_concreto_peru.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/57245704989.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/e6cb66ca2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_600820bb6e6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_6042fe5b6df88.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/tratamiento_de_atresia_de_vias_biliares.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/dopunubokidobeteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_6056e3f515600.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/bawonavid-xavulera-sezak-jotupotitijik.pdfIn PDF document text
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/gijojipup.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/132f3f1d-a725-406e-a254-cabc87037b74/nivanif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ee04f8-9f45-4f73-b460-56cde8bf1f50/how_do_i_make_quinacridone_magenta.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/david_ramsey_financial_planner.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/84713065314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4176ae3-ee92-4695-82ce-b2055462f7f0/35407011647.pdfIn PDF document text
    • http://zilisidojaze.myartsonline.com/25402644046.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/tiger_rice_cooker_10_cup_directions.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_off0001576e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576E 5188 bytes
SHA-256: 07ca470eeec90d48a8934d4027cab7af2306105fd8d3ce3adeb583a9beb4cd1e
font_01_sfnt_off000168f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F5 11712 bytes
SHA-256: 325c65a9dbf42ca1a0b748e019b5750a77f671cc63fda42e05d452180e626015
font_02_sfnt_off000190bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190BC 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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