Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4925218e1e2cbf…

MALICIOUS

PDF

77.3 KB Created: 2021-02-28 22:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 33c5a1843bcb9f30a27ff4972e133013 SHA-1: 86d44cc13fe8043372a8c22db41540204d2d0254 SHA-256: 9d4925218e1e2cbf871c83f90aea9b44fc7c55ffea9c4777ea33e7dede8e3d4e
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm hosted on disposable domains, with a high ML score and ClamAV detection for phishing and trojan activity. The embedded URL, https://nipisod.ru/strik?utm_term=how+to+make+a+bridge+using+toothpick, suggests a lure to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the redirection of users to a compromised or phishing website.

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://nipisod.ru/strik?utm_term=how+to+make+a+bridge+using+toothpick PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd2a5e5bc118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_602ff6dd1b2ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5fde892a23ec9.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/vutotipubeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387571/normal_5fcb4637b2586.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/cattivissimo_me_2_gratis.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/liwakimajuberod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_6037a29e6350b.pdfIn PDF document text
    • http://magicwoolshop.com/geometry_5-_1_bisectors_of_triangles_answersnie80.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/65471766000.pdfIn PDF document text
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/witedepurusudag.pdfIn PDF document text
    • 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/baposivarabuj/jewupazofuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/characteristics_of_economic_systems_worksheet_answers.pdfIn PDF document text
    • http://xegeduv.rf.gd/gagorolipemubivibujekor.pdfIn PDF document text
    • http://zevusup.atwebpages.com/diary_of_a_wimpy_kid_books_amazon_india.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/how_to_troubleshoot_bissell_proheat_2x.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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 5592 bytes
SHA-256: 985dfb2d753ff68f7a8c8edda2183c58750c31992d3867e2e8da3db34c20a831
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 10488 bytes
SHA-256: b228f13c741abdd246df222c4f9e9029e8b13229152115b6392108e14e2f9639
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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