Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bc8858fbad690c…

MALICIOUS

PDF

176.7 KB Created: 2021-05-20 05:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3951e2e026fbeaa8483b8148f8cc4f50 SHA-1: e630ee79c6099424b04216ce528f835970c59455 SHA-256: 18bc8858fbad690cdc78ce6f1565c3d34e1b5d2b4e20f951278579acf681ab7a
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware distribution. The document body, though heavily obfuscated, suggests an attempt to appear as educational material, aligning with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=cuaderno+de+trabajo+5+grado+2020 PDF link annotation
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/5896169.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/tujulosiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_604cc3af88da0.pdfIn PDF document text
    • https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/4855497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_604422fbe19a4.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/zudajixija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_606ae57c088c7.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/6b01d63485314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5ff527e0de4bc.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/jafujasiwetid/vapoxuzevaxaxaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/kajegerironifurozelazig.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/52221842140.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/wijoguwefutasudovideje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd65697-ab24-4489-be16-88cd60c07eed/can_you_negotiate_a_contract_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b8812c-5e70-463e-800e-452060209030/death_cure_trailer_reaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1aded27-def9-447b-82f3-d8f9614f8be3/cisco_ccna_200-301_practice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/the_wonder_weeks_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/mokixezawijizemuvukak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b21b7c-92f0-458e-bae7-bee435d112fa/24922364241.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/xuroxuz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B46 5304 bytes
SHA-256: 60c41a9233739080b26be9d55ce1c1b745a64c0eeac72188976a66d3a60caae5
font_01_sfnt_off00025d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D5D 4536 bytes
SHA-256: bb2a76fcc6f6edaea7f297c34ba775adc10a30516613112fc37aa976d9987158
font_02_sfnt_off00026e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E88 13604 bytes
SHA-256: f320bdf408f5b649babcf73c44971a2119f6fc66ad6b1efbcb74e02c85414fdd
font_03_sfnt_off00029a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29A30 17168 bytes
SHA-256: f60bae8257f3dbc5242319ad5cae35bc0370d8d276bc8918fbd4fb2605fe332e

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