Malicious PDF — malware analysis report

Static analysis result for SHA-256 923fdb9cb1fa8676…

MALICIOUS

PDF

74.2 KB Created: 2020-12-11 03:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 56b5e7cef3554e01ac525e4827c69504 SHA-1: 17312622d3882abc66788202b5d53d5ffd426807 SHA-256: 923fdb9cb1fa8676e95f56aec53913006abd734f79f412619aed40edd589a614
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely intended for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to 'game hacker' and 'apk', suggesting a lure for users seeking such tools.

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://trafftec.ru/123?utm_term=sb+game+hacker+2016+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5fb44555954b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fa228862a07b.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/xuvamuba/xavuwuwuravurotabafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe8fe32-e730-4cf4-a1be-748932e6f213/80395092241.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/huawei_p9_plus_oreo_update.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e925ea4a794d56451110/t/5fc248683c6ccf69f3a8e578/1606568040675/lift_the_veil_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/movuda.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/its_kind_of_a_funny_story_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/zuketagonuzudefusivan.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/using_modifiers_correctly_medical_billing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55c58405d5340f347683d/t/5fc9503e502a52145981d3ac/1607028798671/basketball_shooting_machine_for_sale_ebay.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B9 5924 bytes
SHA-256: e5b2fc5c32c896bae31db1043d916899d387ede38664f0384f8c5a5a53c586cd
font_01_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10532 bytes
SHA-256: cbdf931147342b924496fb5f51245da2f7c35561f5192345770fb6a6db6da246
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 18660 bytes
SHA-256: 2b2c18c396a924d23c067d978a82dfb31cf6d7e5f6a0db548de791168038cf02

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