Malicious PDF — malware analysis report

Static analysis result for SHA-256 6647ffb2ccac1a7a…

MALICIOUS

PDF

168.3 KB Created: 2021-03-04 22:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9071867834ee698633e57ecaebc6e8bf SHA-1: 7f0cbd1d6c401da739834d090635f2dc210eee72 SHA-256: 6647ffb2ccac1a7a3414070127ef8a791b4bc885db9e4b4fa1e47c62de854d63
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 PDF phishing and trojan activity. An external URI pointing to 'xajibur.ru' was extracted, suggesting a phishing or malware distribution attempt. Although the document body is heavily obfuscated, the presence of an external URL and the malware detection strongly indicate a malicious intent, likely involving a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=whats+a+good+scrabble.score PDF link annotation
    • http://rawutunulodewo.iblogger.org/20498226385.pdfIn PDF document text
    • http://popuboloza.22web.org/46324783143.pdfIn PDF document text
    • http://xinupavob.iblogger.org/gummy_worm_vs_earthworm_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jodabiladezot/78613162634.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/charlie_movie_in_tamil_dubbed_free.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_fd9951ecbeb143b980c6b67ec219e3b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/school_bullying_complaint_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/fogifoxubifaxinagewe.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_7900f3fd85614db493d799f2896a7eec.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_97283fbba5884d109ddbe697b28088ee.pdf?index=trueIn PDF document text
    • http://rupiroliwon.epizy.com/bajana_patalu_telugu_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/roger_casement_congo_report.pdfIn PDF document text
    • http://luremugaxufarup.epizy.com/dell_latitude_7290_laptop_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/advertising_books.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_c7c4ddb6d86c42e1b20c4eebd1d23c01.pdf?index=trueIn PDF document text
    • http://genuxemesusirif.rf.gd/pesorugilojajemirusatula.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/javadidarikolojonoko.pdfIn PDF document text
    • http://tolelagegovoz.epizy.com/capsule_full_chapter.pdfIn PDF document text
    • http://kowifojabar.rf.gd/what_are_the_common_topics_of_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/apc_back_ups_es_550_service_manual.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_731ed813d93b43d085196e3fc43a1507.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B23 5020 bytes
SHA-256: 9be08a37c9b6ea27a657e5d5cba7daedaab02eff3b3117ae598f0002aec64e39
font_01_sfnt_off00025c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C50 12120 bytes
SHA-256: daf3a88be75b2fdf42d11137f8d6379898986b44bc4501dd13d8f530b118a5f8
font_02_sfnt_off00028569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28569 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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