Malicious PDF — malware analysis report

Static analysis result for SHA-256 57231d490b0294d2…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 16:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 44f768c526630288bc5eccf784dd03cf SHA-1: ef4cdc720bdda560a87ce3e20559be8a15d7bab5 SHA-256: 57231d490b0294d20b7e05144ec23c965a285325ea9f23ba4f675981cdd9c7b2
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'druttle.ru', which is likely a malicious domain used to host or redirect to a payload. The document body, though heavily obfuscated, suggests a lure related to creating attendance sheets in Excel, combined with metadata indicating it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=how+to+make+attendance+sheet+in+excel+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5fe3f2a5c4e1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fee38cf5531d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_5fea3dcf426e7.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/fibz0ha/sezozodufojuda.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefulurifu/XqifhgA/cladding_sheets_cork.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_6017353b2dbae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60225ba1ae553.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/exgi9gd/android_mobile_classic_ringtones.pdfIn PDF document text
    • 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://uploads.strikinglycdn.com/files/d936cb38-cca9-4838-ac95-d02d7305067b/blink_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/nova_bncc_educao_infantil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055daa18-2b0a-4086-a5bc-1efe499f6e2b/stein_shakarchi_complex_analysis_solutions_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd393ce7-0ce3-4de9-b6eb-a2810bdaaff3/how_fast_will_a_50cc_dirt_bike_go.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24e1875-2c41-499d-8873-9348c6c3a537/dr._gundrys_diet_evolution_video.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/bakery_cupcake_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/batukudubibusogitome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a6cc42-40ec-4925-9be1-48cf996c74a2/canon_mp470_driver_mac_catalina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132ee7dc-92d4-4d7f-81c0-1a8167bae8f7/13924517842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1477a0-2af1-47c7-aa86-5c801cf06aa3/dimomegoli.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/garawuveti.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/98531363213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b0dbe7-08f4-4720-b400-85e67540d8a7/20307404699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5f64ad-5661-481d-8539-1d9c524eac70/unfollow_pro_for_instagram_paid_apk.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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5272 bytes
SHA-256: f18463e7a90ccd36a7ef22b9b0982cd3afc5cd5c9b1f8b468bf8246cc68622fb
font_01_sfnt_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 11340 bytes
SHA-256: 994e9c96825b29ec324821b154db9f686fec88908d9e6b0d8ff9623236173f79
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.