Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ae0842393eb1a…

MALICIOUS

PDF

72.0 KB Created: 2021-01-22 23:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ceb1f997b8e5116905bf02b67db88359 SHA-1: 2766eafe34ffe857b6b59f12f94f7b2b8945e58c SHA-256: a47ae0842393eb1a0591aaf467682883af2824576bffe7324c0d086aee630317
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to 'turn off sticky keys windows 10', suggesting a lure. An external URI pointing to 'baarspo.ru' was extracted, likely serving as a malicious link for the user to click. No scripts were extracted, but the PDF structure and external URL are strong indicators of a phishing attempt.

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://baarspo.ru/123?utm_term=turn+off+sticky+keys+windows+10 PDF link annotation
    • https://cdn.sqhk.co/janonaset/ijgfxjd/4_pics_1_song_level_48.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/fjgBhbs/brazil_fifa_world_cup_2014_squad.pdfIn PDF document text
    • https://site-1252401.mozfiles.com/files/1252401/structure_of_nucleic_acids_worksheet_answers.pdfIn PDF document text
    • https://site-1174611.mozfiles.com/files/1174611/8374063073.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/Wzjdivt/basuxonet.pdfIn PDF document text
    • https://site-1168034.mozfiles.com/files/1168034/simple_sentence_practice_1_worksheet.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/11724389006.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/Rgi5ggf/street_basketball_association_pc.pdfIn PDF document text
    • https://site-1179363.mozfiles.com/files/1179363/alien_vs_predator_evolution_apk_mod.pdfIn PDF document text
    • https://site-1168102.mozfiles.com/files/1168102/pusedubazijojibanoderaj.pdfIn PDF document text
    • https://site-1166673.mozfiles.com/files/1166673/75323718865.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/Egj9tO4/samsung_s7_notification_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/uMWqrhc/zisefobokudufoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/the_good_doctor_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/calorimetry_lab_report_conclusion.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/mixadonagatuwafetari.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/game_tekken_7_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/ruligonitezirinexeju.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/amberley_state_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/botig.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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 5176 bytes
SHA-256: d232cb88c165b32a83854e52ce793356566f0723b1cb5d71fc69a5df58eab60d
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 10660 bytes
SHA-256: 568034ee6202484888edd07c83e7f0f72c595ade0fccb9a9028d46f582d4f059

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