Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f0084dccf49553…

MALICIOUS

PDF

87.1 KB Created: 2021-02-14 05:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 70b34a207959377cca3900e2c1fbaad1 SHA-1: 8295ecb46af9ecf781dea67bd57c1781cfa3bf8d SHA-256: b0f0084dccf49553573948ab2b7e7e3ff3af266f0eded4ebc2d9ca39d6ea3207
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=n3ds+emulator+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369916/normal_600f91e634745.pdfIn PDF document text
    • http://cz-nitrof.website/pirates_caribbean_1oceep.pdfIn PDF document text
    • http://takipleskazan.org/pegidujadurudasuvhf13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462035/normal_600fda433aa4d.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/sanudilixakizipibiwexcgzy.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/todigobaxuvisjcdt.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/bigo_live_stream_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/video_editor_inshot_apk.pdfIn PDF document text
    • http://xugowosapiri.rf.gd/57254130430.pdfIn PDF document text
    • http://wifavar.epizy.com/29413035857.pdfIn PDF document text
    • http://wobemiko.epizy.com/gartner_iot_report_2018.pdfIn PDF document text
    • http://nerepigov.rf.gd/kotlin_multiplatform_firebase.pdfIn PDF document text
    • http://nivomijerunaz.epizy.com/printable_math_worksheet_for_kindergarten.pdfIn PDF document text
    • http://sarebabeb.epizy.com/jedunixalebabulojileg.pdfIn PDF document text
    • http://tasobigadegef.epizy.com/revufovojelisapovapiza.pdfIn PDF document text
    • http://ginokaze.epizy.com/jenetiwixukufu.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/56575039314.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/tuwewedajagej.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 5188 bytes
SHA-256: 8146558427a1c0e54af00034bba5e01362170eb60c589884932f23de2f621ea9
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 11212 bytes
SHA-256: 9204b76ac82437db52349e9298d4f3c953ea906e255a86d15dd8f5b4f16ee428
font_02_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 10908 bytes
SHA-256: 10eaf72f2062df9a993b33d3cde39e62b17cf2157dfac8c3d3d50c3675e73220

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