Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a0cf1046eab8a8…

MALICIOUS

PDF

76.8 KB Created: 2021-04-13 22:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b3f7abd4f469775de8cce2f5e6f81205 SHA-1: 8309b5e90bc6518e84c47286542c6e1ed5aed378 SHA-256: b9a0cf1046eab8a83ca14c3d318980182d0fccfd687bda456ad82ecf4ff0777a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL appearing to be a lure related to a product search. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=husky+portable+air+compressor+home+depot PDF link annotation
    • http://hermidkovo.info/wasepelofukwqiaw.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/wopexuwekale.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/0808ef221a47.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/robumutefetalutisiwee0rkq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/buckland_primary_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912532b9-206b-4b68-96b7-8341c2c6159d/vidaxidolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c370040d-ac5c-4af8-92a0-52be0fe74726/62520137162.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_0da9782834694ce089099d109bab51b7.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_4d0568dcd0d840b48977fe401298bf17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/fax_cover_sheet_template.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_929531e24eb2405eac5ff7900c17910a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/lofepitukijufoxababobeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da34649-846c-4132-af2d-a35ae82f1988/bhagavad_gita_sanskrit_text_english_translation.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_ff141851f86c4010a9f980fccafc0795.pdf?index=trueIn PDF document text
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_49e51eb4524f44ae814bfc3b518610e1.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_10f6d0865e4d481e91cef5a8f636415f.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_b25b97a7f4d842e4aa3f02d3dce080b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/fazak.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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5580 bytes
SHA-256: e57eab39bb514105bc3ad03991f952278b16300e8b005054670e3df448ced99b
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10652 bytes
SHA-256: ed228a4904fac30008eabb4be2b850c56037481f17372729ec64240e9de5e502

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