Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cc8fc7243959fb…

MALICIOUS

PDF

76.4 KB Created: 2021-02-13 15:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0253e0e20a0d59328a16b83c63b32a3d SHA-1: 8b5be74888e1c75dc89b4b8a87f67a49905f0bb8 SHA-256: b9cc8fc7243959fbdacad20093b43db47559ba3f2d16e6a3957e60a4ca658989
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 suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'mediums real yahoo answers'. No scripts were extracted, but the presence of the malicious URL is a primary indicator of compromise.

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://baarspo.ru/wix?keyword=are+mediums+real+yahoo+answers PDF link annotation
    • https://cdn.sqhk.co/nakusunegud/fPidijG/42397686403.pdfIn PDF document text
    • http://affilateapp.online/tixupoparuwixexobchl10.pdfIn PDF document text
    • http://tudovawo.22web.org/biology_corner_worksheets_microscope_use.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/Urhfjhi/super_loud_phone_ringtones_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/clajdAD/23144847223.pdfIn PDF document text
    • http://neliwiveles.22web.org/44946358444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5fd3b50bccf92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fd6aad9b334c.pdfIn PDF document text
    • http://juwatorota.22web.org/egypt_lonely_planet_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevowamudad.epizy.com/60725887478.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/work_rules_laszlo_bock.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/getom.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/moldable_plastic_sheets_kydex.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/fafsa_income_guidelines_for_pell_grant.pdfIn PDF document text
    • http://lozebaloporan.epizy.com/surigi.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/collagen_diseases.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5248 bytes
SHA-256: 5797e20c7774f23ea870d81eea4f8a573e01caeff49bc6413c0316c477255daa
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10660 bytes
SHA-256: 5dfcc85faff06c4de64e68706fb88433c22d464bd16cad8299908ee457b5dd0b

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