Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ce2f18a939d58e…

MALICIOUS

PDF

100.4 KB Created: 2021-06-05 06:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff37bed80656424ddc389f27d33e0d2e SHA-1: c86c4b6caa505a5f18ef2de369ed04deab882389 SHA-256: b4ce2f18a939d58ea4507bc8689a2b372cedf746832a8fb48ddf4d61dba26e4c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with a significant portion pointing to potentially malicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=java+numberformat+parse+double
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/dcaaa2f.pdf
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/965abe.pdf
    • https://fagezatev.weebly.com/uploads/1/3/4/7/134711774/diwenozagarijati.pdf
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/zizegagef.pdf
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/dapijirujek-wuxurevigi.pdf
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/f7767f8f3f6.pdf
    • https://vokevifiv.weebly.com/uploads/1/3/4/6/134657891/e7465b.pdf
    • https://kawifapexevudo.weebly.com/uploads/1/3/4/7/134711131/4728c4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2bad0964-b28b-4001-bb79-56d19523bdcd/international_business_machines_corp.pdf
    • https://uploads.strikinglycdn.com/files/90d84e52-0aa7-4e5b-87af-b50d2a74a611/the_secret_life_of_bees_quotes_about_forgiveness.pdf
    • https://uploads.strikinglycdn.com/files/5009f4a9-62f1-4c3b-beed-d1a35be9a41c/22732070034.pdf
    • https://uploads.strikinglycdn.com/files/952dd150-b950-450c-bd1d-499d0393afb4/head_first_design_patterns_a_brain-friendly_guide_1st_edition.pdf
    • https://uploads.strikinglycdn.com/files/9913b206-ef39-404f-8116-3f7d3411f3f1/43804339907.pdf
    • https://uploads.strikinglycdn.com/files/03374dc5-d3e5-47bf-96eb-f702e8798e37/gutememogepozo.pdf
    • https://uploads.strikinglycdn.com/files/2e77005f-4815-44e5-808b-12f0807213b8/furniture_stores_walt_whitman_mall.pdf
    • https://uploads.strikinglycdn.com/files/3f2fc486-6d87-40d6-af35-a9e4f4de9276/toro_power_curve_1800_model_38025_parts.pdf
    • https://uploads.strikinglycdn.com/files/0c5985a4-1dbb-4a5b-926c-d40d33c4c726/diwowigagide.pdf
    • https://uploads.strikinglycdn.com/files/cadff3f2-6a98-462e-bbdb-cca84f077b1f/29972881065.pdf
    • https://uploads.strikinglycdn.com/files/9ee05366-dbe1-4c49-ac70-d9772bc44a2f/query_languages_in_information_retrieval_system_ppt.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014974.bin
0a2f7cfa9ea5e77b90b849c1d85ae9c4c7fff27ee12823ff80c81fb12b0c1167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14974 5376 bytes
font_01_sfnt_off00015bab.bin
1fbd75a76178dc33203ab0476da34d1103d20c9e398945ba8f37b9c603d1e56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAB 11728 bytes

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