Malicious PDF — malware analysis report

Static analysis result for SHA-256 8252df9109fbcc38…

MALICIOUS

PDF

84.0 KB Created: 2021-06-01 07:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f0e399fff9db2a791784eb115a02c4 SHA-1: 0ed1c3d54b0d0ff9ddb07b6bd6691fe300fd1ce5 SHA-256: 8252df9109fbcc386e287af9ff2c4a15219ba8e33547456732bbb34a9caedff9
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/pbw?utm_term=anime+character+maker+unblocked
    • https://fedibikora.weebly.com/uploads/1/3/4/5/134508081/panijojurap.pdf
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/muwifiparobuge_vozal_megaresa.pdf
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/dokatavug_gixodimomita.pdf
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5ff79cae4875c.pdf
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fe75d9964971.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_5fd85ae2432e2.pdf
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/todizesomezas-gebefuvaj.pdf
    • https://cdn-cms.f-static.net/uploads/4484631/normal_603ab52291456.pdf
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/1623768.pdf
    • https://linugotozoluj.weebly.com/uploads/1/3/4/6/134662393/fenuzawebow-keguwo-biridozoxu-legegin.pdf
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/bapinenusupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wejojixi.pbworks.com/f/passive_voice_past_continuous_tense_exercises.pdf
    • https://uploads.strikinglycdn.com/files/fe64cbca-f52b-4d82-85f8-dbcdce3e5f63/i_just_wanna_be_average_quizlet.pdf
    • https://uploads.strikinglycdn.com/files/dddfaa53-9224-4384-90a1-78092a999470/ejercicios_de_lectoescritura_para_primer_grado_de_primaria_para_imprimir.pdf
    • https://uploads.strikinglycdn.com/files/d50e6ff5-67e0-4d8d-b30c-618b224d74bb/dixokofenepexi.pdf
    • https://uploads.strikinglycdn.com/files/c90264af-d7e3-4070-ad64-2922fa76effa/mgma_physician_compensation_2019.pdf
    • https://uploads.strikinglycdn.com/files/180e2699-9955-4929-936e-dd779323263c/biozone_ib_biology_model_answers.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412260/36910845917.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d864.bin
384a7902e83366ca76fa9143a8446b17a4ed4199a08bb0f052640b2699c0b382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 5424 bytes
font_01_sfnt_off0000eb45.bin
b6d1925ce0d543e702474b3c4f04b950c399c9052ffc83cceddfaf634ad01750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5076 bytes
font_02_sfnt_off0000fc3b.bin
f399b2657390f8d6bc207e51f075d8c2fe35d3c4b1fed131966b61a437adf4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 9984 bytes
font_03_sfnt_off00011e8a.bin
1338520701e983e015bea8810f7583829370aa54ed0683a9748a92fb8086c5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16220 bytes
font_04_sfnt_off000133ee.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133EE 4324 bytes

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