Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d91a1a46509a3…

MALICIOUS

PDF

75.3 KB Created: 2021-03-12 02:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5e8a5a2204526e836cb9bb33ae83110d SHA-1: 5abcbc27ca5a671db6f707672b249f110d7925e9 SHA-256: ed5d91a1a46509a342d163b252165e4ee90bdb56398cbf88d7d02c5d9f56cca3
104 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, indicating a high probability of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to a book title, which is a common tactic for social engineering.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=things+i+wish+i+knew+before+we+got+married+pdf PDF link annotation
    • https://cdn.sqhk.co/sevigexew/ghh4gjZ/44426335344.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/cVDgSia/beechwood_primary_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/dtyiepP/24363774776.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/jfByWoW/notes_payable_on_balance_sheet_example.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/jdGicwl/24963583416.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/jidheDG/devojep.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/bxuyif9/nebasuki.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/02126129-9786-46d3-9148-b20db731c7af/camus_the_fall_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d8ca45-cc8e-4be3-b6e5-52aac3140d53/dosozaxubife.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/fotonotez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8e33fb-1100-4a31-9487-01537f6f3078/24240267070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363fb993-a79c-40d1-a606-04c9f1af18b7/gurimemapolitut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf5db26-5698-4d24-8418-dbbffbb20e29/15678578744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f72d60-814c-49c5-9188-20879a2eae0d/the_witcher_books_collection_hardcover.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/51032124281.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/39061106207.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_f406c66f3e244cf9b89b4fd7cb1f0c31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/960e10bf-8ecb-4250-b1b7-6b94a3e104d5/remington_700_sps_tactical_distance.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_b69d4ca1f9ed461f9f5efa47aa774593.pdf?index=trueIn 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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5668 bytes
SHA-256: 93da0e7b410d7251c898d4e3a558821100c7562d7d434c54fe783b814d03caa6
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10208 bytes
SHA-256: b7e9c3d7b8b84c52165828cb5607391ce1a8e7967a7328d5b5ab39bd370b83ee

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