Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca926a09c2fab52…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 11:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c07a5368ca8438ef73e5bae3c69d997 SHA-1: 134626ab35ac4afc92b64b87157f3d152a1433b1 SHA-256: bca926a09c2fab5241fe3995640b8f948fe1a2feb98d4f82e17146f2580f239e
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to contain metadata related to wkhtmltopdf and a date, suggesting it was generated programmatically rather than being a user-authored document. The presence of an external URI points to a phishing or malware distribution attempt.

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://pelibifir.ru/aws?utm_term=acoustic+blues+guitar+licks+pdf
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fe3e74db7501.pdf
    • https://cdn-cms.f-static.net/uploads/4418185/normal_6055959eddc44.pdf
    • http://kejoxemubogese.mywebcommunity.org/can_you_take_a_tax_deduction_for_working_from_home.pdf
    • https://cdn-cms.f-static.net/uploads/4467273/normal_603514d9e8aa5.pdf
    • https://cdn-cms.f-static.net/uploads/4423780/normal_604cbfab7e286.pdf
    • https://cdn-cms.f-static.net/uploads/4462344/normal_604b463814564.pdf
    • http://deliwubavamir.mypressonline.com/livro_fundamentos_psicolgicos_da_educao.pdf
    • https://cdn-cms.f-static.net/uploads/4449004/normal_6038c52d8174a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lurutopobi/45031130260.pdf
    • https://s3.amazonaws.com/tosevud/12357701283.pdf
    • https://uploads.strikinglycdn.com/files/3ba3df1e-e40e-4d60-9159-cce70a195b24/math_workbook_8th_grade.pdf
    • https://s3.amazonaws.com/zonebon/envato_after_effects_templates.pdf
    • https://uploads.strikinglycdn.com/files/d4381dc0-100f-45c2-b1e9-10b9af32d275/kenmore_electric_stove_stainless_steel.pdf
    • https://uploads.strikinglycdn.com/files/edacbaaf-ce85-4c91-930c-d90acb4f2db4/jiliwewumepufis.pdf
    • https://uploads.strikinglycdn.com/files/fabd6b9c-323c-4128-935d-360ca3e39d81/75582852224.pdf
    • https://s3.amazonaws.com/gixawetopoli/kenajawebipubogenukuxim.pdf
    • https://s3.amazonaws.com/warapagefasovi/ged_practice_test_questions_math.pdf
    • https://uploads.strikinglycdn.com/files/77743301-8d14-4e3c-b392-9fd563198143/36985516020.pdf
    • https://s3.amazonaws.com/resisuna/kgf_tamil_songs_kuttyweb.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_off0000eafc.bin
616155bd10b4e3a4b388cd390f5cd47b5abce5246161f0ba73929bbef435a704
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5516 bytes
font_01_sfnt_off0000fdd1.bin
1e3f8a8adfb0285e00b4a6477fc08d25a5bd3b7bb6f55e59947cf9164f8be01e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 11596 bytes