Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d86b81f7de0ea9e…

MALICIOUS

PDF

80.6 KB Created: 2021-03-16 10:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6204f3290692f30e046f197d5aadd11f SHA-1: 749bf702b0359c4580ee096ce5a9babd5384196b SHA-256: 9d86b81f7de0ea9eca9c5dfe174ed8171037dfe20740d5419a24251a9f70f037
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 URL pointing to 'vilenefex.ru', which is likely used for phishing or to download a secondary payload. The PDF structure itself shows signs of manipulation, including duplicate object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=nespresso+vertuoline+evoluo+manual
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/6424972.pdf
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/zenojuwurajigotisa.pdf
    • https://cdn-cms.f-static.net/uploads/4458628/normal_604d7af07cd54.pdf
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/dinawevimunu_silosatudapu.pdf
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ffc9f99d9513.pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_602a1e7128ddc.pdf
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/1c10826c7d9a.pdf
    • http://lazujifoxupa.getenjoyment.net/paragraph_structure_worksheets.pdf
    • http://jopagozopive.medianewsonline.com/how_to_edit_text_box_in_microsoft_paint.pdf
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5feec61659aeb.pdf
    • http://sevoxotedeki.medianewsonline.com/52454857747.pdf
    • https://static.s123-cdn-static.com/uploads/4401540/normal_5fcb22463f56b.pdf
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff2b9a02cb2a.pdf
    • http://puvinizozibejir.mygamesonline.org/inhibition_of_protein_synthesis.pdf
    • http://kaxiwemusemoj.mypressonline.com/arizona_realtors_residential_lease_agreement.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejimafalun.onlinewebshop.net/what_does_pst_mean_on_cox_cable_box.pdf
    • https://uploads.strikinglycdn.com/files/1265c73b-12b6-4cbd-8bd0-5bb8eb874449/13474761959.pdf
    • http://giworutiw.myartsonline.com/silubenupeb.pdf
    • https://uploads.strikinglycdn.com/files/b8f615aa-59fa-4028-ab59-87006e7f35e3/76166850549.pdf
    • http://gumusimigogasuz.onlinewebshop.net/rivers_dams_and_barrages_of_pakistan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff73.bin
0f57bad4ce318c91a28eb8e74e256bfc505fa3acd0679b0ab54be38aea2fa9b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 4992 bytes
font_01_sfnt_off0001105d.bin
2fba8e3c6e797deb833d6ec6b9356bbf5178a8c8f04039ea9b342303e6cc0a21
pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10880 bytes