Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29bbda75ba2c242…

MALICIOUS

PDF

78.6 KB Created: 2021-03-08 12:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7ea994f369dedbf5f2d022d621a5b9 SHA-1: 266d5ee99c6edeb81d97919620b418d4a326f2e3 SHA-256: c29bbda75ba2c2425d5b6b5fb59e3ae515e74eea9acb3c1fe87a74dafe3d0af2
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 critical heuristic firing for ClamAV detection. An external URI pointing to 'druttle.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a guide, further supporting a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/wix?keyword=cenarion+expedition+rep+guide
    • https://static.s123-cdn-static.com/uploads/4449187/normal_6009909e7a96a.pdf
    • https://cdn-cms.f-static.net/uploads/4463809/normal_60258d2f40bbe.pdf
    • https://static.s123-cdn-static.com/uploads/4479673/normal_600638b0e95bc.pdf
    • https://cdn.sqhk.co/nuditufu/yhapWjj/starz_app_directv_login.pdf
    • http://wutoxurusot.iblogger.org/walmart_school_uniforms_pants.pdf
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5ff016c80b34f.pdf
    • https://cdn.sqhk.co/fokofike/9jiNmBf/easy_cake_recipes_with_basic_ingredients.pdf
    • https://cdn.sqhk.co/bulunazi/h6gh0J2/xmeye_playback_not_working_on_android.pdf
    • https://cdn-cms.f-static.net/uploads/4382781/normal_6011dec63f8a2.pdf
    • http://loxalobew.22web.org/cuisinart_cbc-00_manual.pdf
    • http://manubazarexom.22web.org/how_to_use_my_ge_convection_oven.pdf
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fd201bfae74b.pdf
    • https://static.s123-cdn-static.com/uploads/4386334/normal_6006b794b9e7a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gumagabu/zotajogabaderimezawegi.pdf
    • https://uploads.strikinglycdn.com/files/37219978-d225-419c-a2ef-044fa938f7c6/learning_radiology_4th_edition.pdf
    • https://s3.amazonaws.com/dutimajizowa/kezevaxowaguweverivatuka.pdf
    • https://s3.amazonaws.com/penefelomiju/15395210242.pdf
    • https://uploads.strikinglycdn.com/files/d269b26c-7653-47a6-90ed-ef84b886e107/24741281120.pdf
    • https://uploads.strikinglycdn.com/files/8b7a5c67-b04f-4f5a-b86c-7f43d93c71de/14705751996.pdf
    • https://s3.amazonaws.com/fokapikow/arch_linux_install_uefi_guide.pdf
    • https://uploads.strikinglycdn.com/files/28229eda-603b-43c5-9d20-2389479ebcf8/how_to_replace_hardwired_smoke_detector.pdf
    • http://wigamewekafon.rf.gd/biased_and_unbiased_samples_worksheet.pdf
    • http://gizimup.epizy.com/balupu_telugu_movie_naa_songs.pdf
    • https://s3.amazonaws.com/wulagisi/t1013_form_fax_number.pdf
    • https://uploads.strikinglycdn.com/files/cc85d169-3574-44be-b35d-f2857468e78e/92443467831.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea87.bin
f5477f227f515f94a074777fdf0cf84a64af7084c8a4b883a752cdb8ed17fa18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 4888 bytes
font_01_sfnt_off0000fb3a.bin
106f85bacecd37d06d92c122aa1f51c4262ce9666b30e6cbd134d2714236f4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 10420 bytes
font_02_sfnt_off00011ea0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 4324 bytes

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