Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfb521260fb8636…

MALICIOUS

PDF

72.2 KB Created: 2020-12-15 05:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5cd47a21fd2d2fde71a24b3114141637 SHA-1: e8b06c307fa03167c432a90812b08ca5c2e26c48 SHA-256: fdfb521260fb8636a63bf49edd4e14b27561d647b033cb2b7d4a6d6fff196dfe
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. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing the user to the malicious URL. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=what+does+evaluate+mean+in+math+example PDF link annotation
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/musobal_lodulamala_xikasojewal_rinatubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f3db90-620f-4f36-a28c-999d3521f500/halo_dmr_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/define_collective_bargaining_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/49608190997.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ba71e9fc3622d52139a6/t/5fc0e9e05147b1480454f358/1606478305320/29661276616.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/zedaj.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/6681470701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abda00ef-2802-4e7a-8174-8e54925f3665/73107751292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788d847-6b5a-4ac9-97bf-e9df5163211f/38055834155.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_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 5244 bytes
SHA-256: ddc847a7b4f02d90c9c2ad2596f6dbd1e74d71bd32281c688ed8db6169f3d3c0
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 10852 bytes
SHA-256: e638f8fd58d6e86b90b4e6af857ddecbcf414a3fc566ba03f3590a3aea015456
font_02_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16132 bytes
SHA-256: a893a350609614515d9392b388b4bef759cafe0688d97bfeb8c0eae08b8734a3

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