Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3513a1821f0a47…

MALICIOUS

PDF

120.4 KB Created: 2021-02-23 15:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0bab23d3d4860698e664871a9321ba63 SHA-1: 1bd0f495d9737770217852bd39647b35c6f4dbe6 SHA-256: ff3513a1821f0a47f1ebef1b4db13231770cfc237450824bdba0e0e90dec440a
96 Risk Score

Malware Insights

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

The file is a PDF document that contains multiple embedded URLs, one of which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/123?utm_term=what+if+i+don+self+isolate+before+surgery PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5ffdbe6a04d2e.pdfIn PDF document text
    • http://mscredit.info/sobizikinomnod3.pdfIn PDF document text
    • http://erethiztzj.space/herman_miller_aeron_side_chair_reviewux0uv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5fc6d002eeede.pdfIn PDF document text
    • http://pixell.store/zifosiwuledenaxewavusod5tr68.pdfIn PDF document text
    • http://opssmall.space/nujilapubowovajemudecohd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_5feda0a6db842.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ihgMgex/31664716231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_601a4c9d32690.pdfIn PDF document text
    • http://potolkilife.ru/vewupefabopuwuwuza05x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_601cc0ffaaa52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6033e402c7850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_600b3e4b44aee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fc80c2acd146.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/dZnFZhd/word_nut_level_143_answers.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/rorives/39288730640.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/facebook_login_app_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/60118709993.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_off00019907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19907 5424 bytes
SHA-256: d289db86c6d64031bbf4e31fccada1898069d42bc1769853ec5f2f6d6358c93e
font_01_sfnt_off0001ab87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB87 12548 bytes
SHA-256: 99d3f92e683e6d6786b8b13167a012559f270bc3a234e4bf861d055240d928de

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