Malicious PDF — malware analysis report

Static analysis result for SHA-256 6491ce35bc7f7a65…

MALICIOUS

PDF

77.2 KB Created: 2021-03-28 07:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 93c0e073b771fafd575ab4400f221b90 SHA-1: be579ef017abcc65cbfc96e018d0204cee21fef5 SHA-256: 6491ce35bc7f7a652c2aff38affaa59f257ddc94faeb83af987100f0e81f8ca3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The primary URL, https://leonvi.ru/award?keyword=how+to+use+google+search+engine+effectively+pdf, suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://leonvi.ru/award?keyword=how+to+use+google+search+engine+effectively+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451348/normal_60402716747ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_5fdbca51cab95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475203/normal_5fe183255d7c5.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/what_is_presentation_of_self_in_sociology.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/anaemia_types.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_6004147fc9fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489994/normal_6000abf6c57de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405179/normal_5fc6af6ff39fd.pdfIn PDF document text
    • http://fionainthefield.org/photoelectron_spectroscopy_pogil_answersowu55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_600e7c944ffb1.pdfIn PDF document text
    • http://marketitaly.pro/apple_caller_ringtone_freenb1qz.pdfIn PDF document text
    • http://makedctl.site/70769821400c91rx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_60119fad90229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5fdc3c963f4b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fcae781dd798.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/39907520910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_600b5643d3cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fcd1c92aed10.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://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_adb01b9c758c4d76ab3808d96eac372b.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_30d2854d0d1d486684c9ce93afddee8d.pdf?index=trueIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_de5f13883cfb4cfca98d7c2714174761.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 5516 bytes
SHA-256: 024ec1031ce739584c97848d579ff54bee0d0e64871cc3b774ba9190071c2434
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10412 bytes
SHA-256: 4de891a051b4e9508faa026ac948f95a7315258f3501052e433db36248c46393
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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