Malicious PDF — malware analysis report

Static analysis result for SHA-256 827f15ebcf7f9b7d…

MALICIOUS

PDF

68.9 KB Created: 2021-05-30 22:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a56fe8319aba4c6df2478936e5d1e13b SHA-1: fc2e73bbdb675a79543a5b3998e9932641d37c14 SHA-256: 827f15ebcf7f9b7d360248ce81a37cdad3b4543cb67730ec9ef5f505977b5067
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one suspicious URL pointing to 'jumiwimov.ru'. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content or facilitate further compromise, aligning with a phishing or content-farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=igcse+business+studies+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465131/normal_602f33db46ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_604f21d3035df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_600691ffa7ec0.pdfIn PDF document text
    • https://juguxusomusivu.weebly.com/uploads/1/3/5/3/135327365/b126e1d9007fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_6015d068d6d6e.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/5025482.pdfIn PDF document text
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/9352435.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/75496014-23fe-44bc-81c4-5c9a3606a1aa/how_to_write_a_sbir_proposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca5eb8a-e1d5-4b23-9f2c-0aebc7e71d4a/basic_engineering_circuit_analysis_10th_edition_solutions_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2215a0e-0191-444e-965b-557f809a494a/2238262863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecfbb89-8e7f-439c-8582-34864174fd0f/48685377157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e903c000-aea2-4903-b97a-bee9238ed893/sukulev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca759134-20b4-40e8-b828-2b2d55dd6c83/cannery_row_restaurants_monterey_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67979da5-15bb-4791-9743-1e74c8eb904e/libros_sobre_economia_politica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b15e94d-aae1-4bf9-b2b6-4af4a8c23d2c/how_to_clean_the_nespresso_vertuo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46747743-3e30-4ba0-bc98-57681862690f/forty_million_dollar_slaves.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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 5316 bytes
SHA-256: 66cdc942701d63e57eca3d5e4ece7fbe9ad423afc4b22cc49734152f93ce96f7
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10472 bytes
SHA-256: 05ad841715e0c2693a8bc32c2f585dcc5dd627df9b591907c9a83a2ec673e2f4

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