Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1e8dd71d25b912…

MALICIOUS

PDF

81.2 KB Created: 2021-04-10 03:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f77c5249a2f2cd05df9e91c19996e45a SHA-1: 472ad8ce53a66103b3d37c0fbcec22dea97d4cac SHA-256: da1e8dd71d25b912e0ee8a5d019dfd72e9ee07085e9415c980936655dc32f49e
226 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the presence of external links and the document's structure are indicative of a malicious PDF designed to redirect users or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/strik?utm_term=roman+numerals+ks2+worksheet+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481423/normal_600a226feda93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_6062fdd4c342e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_6030154e66ee7.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/52fb546cfc746.pdfIn PDF document text
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/mavegazipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6067012f546c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_6007bb2906024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_6006f7351c687.pdfIn PDF document text
    • https://bawokuxuduxiv.weebly.com/uploads/1/3/1/8/131856062/tezobapufimoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5fea117c69b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_60412e6646cad.pdfIn macro / runtime command snippet
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/mafunufisewikozok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wowonesoribu/57070957370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462a1a81-09cb-43e4-8baf-6ec62987314f/pozenixit.pdfIn PDF document text
    • http://regenazuwirege.epizy.com/ripokitelunudikekog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cc12b2-a2bc-4396-a234-6e1b02f1bc28/times_table_worksheets_for_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/cfisd_calendar.pdfIn PDF document text
    • http://faberaladaruz.epizy.com/equivalent_fractions_tenths_and_hundredths_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/65246286814.pdfIn PDF document text
    • http://zefinut.rf.gd/all_cmd_commands_for_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 5136 bytes
SHA-256: c90f822eedf7c4d393a426f2a366276dd221537598cbcc933d6cc3f4b1d2a0be
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10964 bytes
SHA-256: 6416a1f9c5166153a84cb6ee47606324ee6090f907db0c88180c3a5caa278345
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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