Malicious PDF — malware analysis report

Static analysis result for SHA-256 831f6281ae61286d…

MALICIOUS

PDF

71.1 KB Created: 2020-12-16 12:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f4a4919434c3e2b743ad062d55adfb16 SHA-1: bb221f2f5b6a16c2c928d60495e877d82edbd3bb SHA-256: 831f6281ae61286d744aa6b0184cce2424969d7c843db4e4b38bee369294994c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit users through a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafffi.ru/123?utm_term=past+participle+in+spanish+ser PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bejikefowu/rujivilo.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/geropufagozerazusafenele.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/21713728597.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/sipesijaferawere.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ec032cf09257bd856c41/t/5fd5fdb472b1137fa96b50e6/1607859636819/37784608281.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/zavegub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58ba9c89e1c4b8fde24ba/t/5fd6bc3aab777271769d59e7/1607908438815/carnegie_learning_algebra_1_volume_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/ayatul_kursi_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/biotechnology_projects_for_students.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc578f6405d5340f3488c89/t/5fd60763b1c3f31c7a775eaf/1607862115544/92383626325.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c9703dfdd95b60f6a0d0/t/5fc5ff3f4f98375720ad13b6/1606811455901/kazokavazuvorarine.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/agneau_de_dieu_messe_de_la_trinit_partition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc013b624b06a7eb3fa8a9b/t/5fc5b097645712565400b463/1606791322121/latuwofabevu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 4700 bytes
SHA-256: 4dd36007ba9cd8e385214f6c2bb3b39a129195f51da9e873cee465c13603fb22
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 11320 bytes
SHA-256: 71cdf000b4eeee625c98b2a20d501dc81cc569eaf4a936671542a5d45c491ef0
font_02_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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