Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98f4e17c8a3bdc9…

MALICIOUS

PDF

89.4 KB Created: 2021-06-07 00:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d857f0f667676952710b21e7376e2ed0 SHA-1: 69e0fb705cfee60be73ce6b407b24fd5c1be890b SHA-256: c98f4e17c8a3bdc9d4bea45b94a0a1a0e7e1e19e6651062f6b54b01b884ec7fd
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'geometry pdf'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/123?utm_term=vsepr+geometry+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489587/normal_5fe2acc64d880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fc7c6fd22307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5fedfe1e95ecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5fe503918a227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_60450cc5d5223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_600626760b443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_606ddf4e902d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6032e61ecb64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_602c33d0b1972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_6056cb9dad68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_604e188b99e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_60583d2a87c06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fcd3d4ba2ae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5fedad52df12a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff3391ebb01f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_5ffa33ffc9525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_60bd37d51685a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_600a2190534be.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/f1a7f03c-0333-486d-9875-faa78b127c68/61022028550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab617db-3867-4f10-88db-377038a287b4/nikon_d5100_manual_focus_rangefinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c176011-ccd3-4a36-a255-32efb1c4dc39/myron_mixon_bbq_cooking_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3f78b6-3935-44aa-880b-0ba8635d304d/how_to_make_a_motion_activated_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1e1440-d591-4f39-8331-2328dadf5769/puxizu.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_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 5188 bytes
SHA-256: 5aea0a5103270a1fe74ffdd58d6f419191f3545cd116fc4b9663357443a65caa
font_01_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 11232 bytes
SHA-256: f39eb20a7ae31f4d1a216acec63da514300a7ec190b06f506e474fc7a04dc47f

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