Malicious PDF — malware analysis report

Static analysis result for SHA-256 6437441e3919ddf7…

MALICIOUS

PDF

78.6 KB Created: 2021-06-03 11:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bef427f42338275b303a3ce73a6910d7 SHA-1: 51520293b15e2f28465a4e15c2ce58e672057c4b SHA-256: 6437441e3919ddf7be043aeacbaffb68a93f3cb1798b75d4bb4e47c32f75d5da
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that leads to a suspicious URL, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing attack vector.

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://krisoc.ru/pbw?utm_term=how+do+i+reset+my+cvs+heating+pad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff698bd83f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_602c71b7b93ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407062/normal_5fc760a53bdc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5ffea6e9d5a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368244/normal_5fed071a68b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_603e3995ed34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_600ecb28e2393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_605153af9944b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_603e086ad288c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_605192665efba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fdc527a97774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424672/normal_60051fbe435d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_6006a0910bf25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_606178dde1102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_6061063115efb.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/bd0cb5be-ce68-45d9-aa4e-9d0ed9578181/36533162563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d7840a-04fa-4f28-9d8b-8b1d6f15c96e/16289691235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c59abf5-31d3-42d7-b940-2d8fe3702cec/kenmore_top_loader_washing_machine_not_draining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aae1c2f-57f8-41d4-90d3-330c9558ea54/vikikozixufamadumodo.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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5672 bytes
SHA-256: 93519dd6488bcf324887a7eb5eb8f91d10488963a0a7da1dce820fae13bee9a9
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 11080 bytes
SHA-256: d8a5262cd464b0ad86f628a7b2c7fffa7718cf25e6c6e6bf038f5feb1d556daa

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