Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad68dcd797e0190…

MALICIOUS

PDF

70.4 KB Created: 2021-05-06 01:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 650ecba16edfdb31d14c18564a3671c0 SHA-1: 12ccbb2757a4b8e9607adb4ea3cbc838f456eac6 SHA-256: 2ad68dcd797e01902194abea6196503eb7463f3e63953514a9cfd48af614f134
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name of Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. The document body, though heavily obfuscated, contains keywords related to PDF and probability questions, aligning with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://xawuzina.iblogger.org/jurnal_bahaya_boraks.pdf
    • https://cdn-cms.f-static.net/uploads/4383146/normal_605cb621d1468.pdf
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5fcd012c3e420.pdf
    • https://cdn-cms.f-static.net/uploads/4475196/normal_6060424065c18.pdf
    • https://static.s123-cdn-static.com/uploads/4486042/normal_6004cd93cdb77.pdf
    • https://cdn-cms.f-static.net/uploads/4382194/normal_6026b0c4a7e86.pdf
    • https://static.s123-cdn-static.com/uploads/4405206/normal_600665377d4f5.pdf
    • https://cdn-cms.f-static.net/uploads/4408601/normal_600fcb9b4963b.pdf
    • http://dowezujuzuzos.22web.org/89652438912.pdf
    • https://static.s123-cdn-static.com/uploads/4462974/normal_5feb9c83a895e.pdf
    • https://cdn-cms.f-static.net/uploads/4470981/normal_60510f365335d.pdf
    • https://static.s123-cdn-static.com/uploads/4408582/normal_5ff345aa2aaba.pdf
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd153e6c8135.pdf
    • https://cdn-cms.f-static.net/uploads/4469850/normal_600fbb64d357b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=probability%20questions%20and%20answers%20pdf%20grade%207
    • https://s3.amazonaws.com/tabobujimo/xonilopokikarekamige.pdf
    • http://sowutafamewuben.rf.gd/anestesia_topica_dental.pdf
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_89debf50fdb04122af8936505be4483d.pdf?index=true
    • https://s3.amazonaws.com/xufoxorog/bangalore_days_malayalam_movie_songs_masstamilan.pdf
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_4d88c2ea7c9b4e7899fcd992fb44aca8.pdf?index=true
    • http://nezixaleweku.epizy.com/bosch_automotive_handbook_9th_edition_download.pdf
    • https://s3.amazonaws.com/salade/mirowupimazapudububaxe.pdf
    • http://giduzorim.epizy.com/29551345180.pdf
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_0970425525914a1fa0e16d8e4e9357d3.pdf?index=true
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_3e86ce8e34be48e59fdc512986491c3a.pdf?index=true
    • 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_off0000d385.bin
660a818ef67ebe02f7ab600d3645e70f16a73797ca8ec777acd7b7f71a882e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 5748 bytes
font_01_sfnt_off0000e739.bin
4e6dd00e7784460a8884c9ec5b3cb5638e59037e6ee7c533c108c5f06509b9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10820 bytes

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