Malicious PDF — malware analysis report

Static analysis result for SHA-256 02877e619fce7f52…

MALICIOUS

PDF

74.3 KB Created: 2021-05-28 13:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 46f0f2aa5cb3b39456ee1cd7d690a0c2 SHA-1: 3efe105fcb36e6cdb7c755ddb05d5321046c5f0c SHA-256: 02877e619fce7f52ab1d19803743f10eaf263ba7bedff57057e1a25b10cebe0f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The primary malicious URL identified is jumiwimov.ru, which is likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://jumiwimov.ru/strik?utm_term=2+times+tables+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421969/normal_600bbe7e1680d.pdfIn PDF document text
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/a91fbf01f18d518.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478132/normal_600539f3929e4.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/bevopipavini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_6026fe7e62a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_606ce442b3219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_606b84739681e.pdfIn PDF document text
    • https://viwejabaru.weebly.com/uploads/1/3/4/7/134749074/3035a871ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6068aa85066b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_6005ec520b227.pdfIn PDF document text
    • https://vajepixujilujed.weebly.com/uploads/1/3/4/3/134331233/264409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5ff9a78cbe88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_6024f12305bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_600de03f8b441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fd7d4d88925c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_600e83d65a789.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/22f7ffbf-4fe3-4517-9a1f-0ec413754992/codigo_ascii_para_vocales_con_acento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae837142-e347-4cdb-90e7-5ca484da3df1/rca_executive_series_phone_manual_25413re3-a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c64a0b-7d48-4973-afb7-3bbf499a8152/76784524258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9eae1be-aed0-41e2-8a73-d57d2faf85f4/tubatenolizurejaferijeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6993bcc0-cb66-4cf2-af25-0553fd8b2304/pidixurebukofepaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0ebed6-44b0-42eb-baa1-307a1f3e2305/xufasonerojajizokelig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739dbf27-6079-433a-9ddf-e2ffe0054eae/sat_test_prep_3_units_7-9_answers.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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 5256 bytes
SHA-256: 7c75868e1fd09e90be9f91a9866a713b1038247f144c11e473214c74459c09aa
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10284 bytes
SHA-256: 359baef93e47de132e6901353d77abb75299dc84c9ee5dacb9ff43bfe2aca051

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