Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec88f5c57da609d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 19:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05bcf25add89bbb4900e27292b16c7bf SHA-1: 7e0b4b63fad343b056a068a0f2b723676d2cbbc3 SHA-256: dec88f5c57da609db929fff7483914a879885b9b783dfac909ff1be06634255e
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to learning English, which is a common pretext for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://seumenha.ru/award?keyword=apostila+para+aprender+ingles+pdf+gratis
    • https://static.s123-cdn-static.com/uploads/4456712/normal_5fdfff7b2cc31.pdf
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5ff76f50b2619.pdf
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5ff634fbb2ad6.pdf
    • https://cdn-cms.f-static.net/uploads/4374835/normal_604d2c2ccb326.pdf
    • http://dkshlyap.ru/vararukebafuwajebafsv9c.pdf
    • http://tulusujubige.mygamesonline.org/buick_century_2002_motor_oil_type.pdf
    • http://dokojekiferej.mygamesonline.org/nostalgia_soft_serve_ice_cream_maker_instructions.pdf
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fcb443971d54.pdf
    • https://cdn-cms.f-static.net/uploads/4485714/normal_603e082dd7ced.pdf
    • http://yesnutural.space/adding_fractions_grade_5_worksheets29qa1.pdf
    • http://lexaxak.mywebcommunity.org/25294931462.pdf
    • http://salonhq.xyz/66476785041mlub2.pdf
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5ff3f3ee5e972.pdf
    • https://cdn-cms.f-static.net/uploads/4415055/normal_601420b1a1cc7.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_6041b30153def.pdf
    • http://yoga-italy.space/durg_bhilai_cg_songnshfr.pdf
    • http://tejovotemikodes.getenjoyment.net/vubafivaxivixawinoradopo.pdf
    • http://zonizubiro.getenjoyment.net/16700370610.pdf
    • https://cdn-cms.f-static.net/uploads/4501660/normal_5fe8e5fc7ba96.pdf
    • http://ronifibofizet.medianewsonline.com/71439577699.pdf
    • http://sazinoz.mypressonline.com/types_of_hydraulic_actuators.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_b4c181564df14669b8c997fbbefa0878.pdf?index=true
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_dbecaeef47bc46039a695f6d76bcea70.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_eb29d744651c462a86ae7225c0999d4c.pdf?index=true
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_639ab41b32f645bd8e942793d94c51a3.pdf?index=true
    • http://saxodanokijaj.atwebpages.com/35839739671.pdf
    • http://sogoxutagejuno.atwebpages.com/susan_forward_emotional_blackmail_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee33.bin
385008f9e82bcfc0c683f74bf13a0d96565b34a924c1d76c591c65128d6d97e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 5200 bytes
font_01_sfnt_off0000fff4.bin
1a20366ba0230b1f285e02c05a62d46e89413118e70d0bdd83d91386343d4f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 12680 bytes

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