Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4899055550d26a…

MALICIOUS

PDF

71.1 KB Created: 2021-03-30 12:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cd5d915d09366a60fc9054d35bf3c577 SHA-1: ba6f60db0b550ef2ae793b59ce602bcaa2da3546 SHA-256: 1d4899055550d26a62721f26d6cd211b9e0bcf8271af2df003ce5b017439705d
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a 'download button' heuristic suggests a lure to download further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=past+simple+irregular+verbs+exercises+pdf+6+primaria PDF link annotation
    • http://femokotafi.66ghz.com/l_t_financial_services_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_60570bb74780d.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/96825188695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_600be17cd8af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_600d803e7c8f0.pdfIn PDF document text
    • http://sanaletetifon.iblogger.org/intercompany_matrix_template_excel.pdfIn PDF document text
    • http://nokobefisedo.iblogger.org/bureaucratic_organisation.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/beginning_piano_sheet_music.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/jumping_the_broom_wedding_tradition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_fa6bf3cdcc784b1eab302f01893245fe.pdf?index=trueIn PDF document text
    • http://vuvuvemalazot.epizy.com/zunivoteputijoto.pdfIn PDF document text
    • http://povutov.epizy.com/89422771656.pdfIn PDF document text
    • http://jutesokom.rf.gd/yaesu_ft_7800_review.pdfIn PDF document text
    • http://romipozaxijida.rf.gd/64300880666.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_d7d70633bc474178bcace62e171ecc12.pdf?index=trueIn PDF document text
    • http://kiwasebax.epizy.com/wapujojufijunilaj.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/sojevimetimilano.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_2cca3157132843a1822a2cde41cf2885.pdf?index=trueIn PDF document text
    • http://wifovofor.epizy.com/wogejet.pdfIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_b212cf00695449c59d286ff5a3575ca6.pdf?index=trueIn PDF document text
    • http://jaxarafepemu.epizy.com/44237600834.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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 5900 bytes
SHA-256: 295453c35f8e0a32ab82375803457f5b30916f1e5ff809de85fa63758d99fd4a
font_01_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 11484 bytes
SHA-256: 3a2e2f8af87ea1612fb1c73b8d75427541e752c7285a08fcdfd2b25c37ca3581

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