Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b7db59e2bb5057…

MALICIOUS

PDF

76.1 KB Created: 2021-03-10 16:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: fdd081b5aaf3de92c1467936cde90888 SHA-1: f715a52b8a2058f0879ee8aca36e3da02faa2b16 SHA-256: 89b7db59e2bb50575a4fd235fb76823c03be3e699ae2e1bf2d2b54bd23c4de72
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using disposable hosting for such links. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=the+odyssey+book+1+study+guide+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5ff33a6c6a028.pdfIn PDF document text
    • http://xepomujix.22web.org/bericht_schreiben_zeitform.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/3139572.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/fekegizuwobexotuza.pdfIn PDF document text
    • http://frankiearvelo.com/possessive_nouns_worksheets_with_answers4z67s.pdfIn PDF document text
    • http://ufenmac.com/tigubenasovitiri629v.pdfIn PDF document text
    • http://goloszauniver.fun/jifupilusibutixonodoxes40gq9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_601dca2a31812.pdfIn PDF document text
    • http://yourcy.com/mimajofegowufipusazimussudu5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6036c4817dc45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_5fdbd6dcd6681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5ffa3b5f987c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_601ce1ee2a161.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/pujakujufuwutu_lowarinolozifo_diwoporika_fafelerajo.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/rofawe_tutiwogasupaw.pdfIn PDF document text
    • http://loveantravel.xyz/luponiwatonimurujugi2iw0x.pdfIn PDF document text
    • https://maxawoxemun.weebly.com/uploads/1/3/4/6/134615094/e739e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fdb1b5077168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakuzilezozo.epizy.com/concrete_texture_free.pdfIn PDF document text
    • http://nadalapaxizo.epizy.com/quickbooks_online_journal_entry_report.pdfIn PDF document text
    • http://vulomalizekuvu.rf.gd/2019_deped_e-_class_record_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/52621897821.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/presentation_folder_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/8732405163.pdfIn PDF document text
    • http://lorazak.epizy.com/how_to_write_research_paper_apa_format.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 5452 bytes
SHA-256: abbf489cf16dd124c4899c6a2f98dfc182a2f9b7819d2e7570c6e75afc3b4dc4
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 10504 bytes
SHA-256: ae636c03fbddbfcf60dc2dfb0d2b67d360dc62163f7cc951050675bf18adb77e