Malicious PDF — malware analysis report

Static analysis result for SHA-256 5650748b6288ef7b…

MALICIOUS

PDF

77.5 KB Created: 2021-06-01 13:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d59840f7de8cb057db7abb52ed89e4 SHA-1: eb548bee0ebfb169bb9e2afcdcf8ea057f46336d SHA-256: 5650748b6288ef7bc75ebfba9fddb13e3c66e2390790f711cbb5a7a4995833e3
96 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 'https://queure.ru/pbw?utm_term=dumpper+and+jumpstart+for+mac', which is likely the primary lure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/pbw?utm_term=dumpper+and+jumpstart+for+mac
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5fdc4362a7139.pdf
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5fed926a89b6c.pdf
    • https://cdn-cms.f-static.net/uploads/4479674/normal_60110ce47bee6.pdf
    • https://cdn-cms.f-static.net/uploads/4378628/normal_6018221a752f1.pdf
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5ff89fda6a1cd.pdf
    • https://static.s123-cdn-static.com/uploads/4417222/normal_5ff91d1e37a7c.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_606df3f645789.pdf
    • https://cdn-cms.f-static.net/uploads/4401545/normal_60249ed661b13.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5fe8f9b428886.pdf
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ffe181143f9e.pdf
    • https://cdn-cms.f-static.net/uploads/4485930/normal_602f17ba6d486.pdf
    • https://cdn-cms.f-static.net/uploads/4403415/normal_604b8f09f37b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nadupodifado.pbworks.com/w/file/fetch/144448230/vocabulary_crossword_puzzles_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/8e6d148b-a503-4793-9680-0085e4d7a1d0/wemubibukezenuzan.pdf
    • http://garigor.pbworks.com/w/file/fetch/144427959/mektoub_my_love_intermezzo_720p_download.pdf
    • http://lakebimutep.pbworks.com/f/property_management_agreement_form.pdf
    • https://uploads.strikinglycdn.com/files/c3d8aa5c-ef2d-4e8d-9fcd-025a7ce1e4fd/20_oraciones_presente_simple_afirmativo_negativo_e_interrogativo.pdf
    • http://gajufabeke.pbworks.com/w/file/fetch/144423336/80452781275.pdf
    • https://uploads.strikinglycdn.com/files/e49b3936-e668-4b24-be15-38229f5bab69/fifty_shades_of_grey_im_fernsehen_2020.pdf
    • https://uploads.strikinglycdn.com/files/0ea796af-2378-43f5-9744-1f1236dc7c87/yeti_microphone_amazon_uk.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_off0000f1bc.bin
09488deba0c70cf1930bfef8b482edf0d51d823e3360054656d887c973d526b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5344 bytes
font_01_sfnt_off000103d7.bin
fc2f2e5a7f37909ec7040fd2aaba157f1285ae64fec9fe0eb2bdd0fd546929fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 10824 bytes

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