Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e67b79958514629…

MALICIOUS

PDF

76.6 KB Created: 2021-04-08 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0645313dda46d152973fb18bc02fdbd5 SHA-1: 4616e3aa28f3bb9bd97518e81ce4573a17365510 SHA-256: 5e67b79958514629b94500e49ad885f826401278246545dfc45bd285b57e8ca5
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, with a primary one pointing to 'https://vilenefex.ru/wb?keyword=arby's%20menu%20nutrition%20sodium%20content', suggesting a phishing or scam attempt disguised as nutritional information. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

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://vilenefex.ru/wb?keyword=arby PDF link annotation
    • http://wofefudolojet.mywebcommunity.org/dofodowixujef.pdfIn PDF document text
    • http://dipurenirexo.22web.org/3743431927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_606099e3551d9.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/39106000201.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/ieihgcW/lebemowoseduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60586a9946b38.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/zgfMig7/hitman_2007_trailer.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/dapasuzesawunelevamapum.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/0d3sXQH/vivozumewilewe.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/ohio_state_university_medical_center_map.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/qhesWhg/best_shooter_games_pc_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8dc8fd-88e0-4b65-97f2-fa042c73b336/36989828833.pdfIn PDF document text
    • http://zizakipu.epizy.com/win_10_1903_tool.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_133b82d84b274708aa8949dd816964b7.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_3b67916461294fc9b67c12447bf685fa.pdf?index=trueIn PDF document text
    • http://doguzikeva.epizy.com/jitikosipozafezomenu.pdfIn PDF document text
    • http://kakidaja.rf.gd/98006251518.pdfIn PDF document text
    • http://mejomulo.rf.gd/cengage_chemistry_book.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_538ac9f6f49b487c99a16c9222331ada.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d883a59-d53c-4976-8d93-987f2c563cf4/39195951882.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_550816d439ee42d29b6ef2cfa7e5ed53.pdf?index=trueIn 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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 5108 bytes
SHA-256: 4a322f847755dc5fed194b295ae8252fb3759855cadb3230ca6e6147310bf7ca
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 10796 bytes
SHA-256: 8da9bb15078615c865e54689581cb71a8fff602030105798f611d781514100d5

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