Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb524d76c23dc4a1…

MALICIOUS

PDF

61.2 KB Created: 2021-02-18 13:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d5252ed0b011da5e12a60d17c250c60b SHA-1: ec8d1423879ad2c6dd9205f38f3320513a3e7027 SHA-256: cb524d76c23dc4a1572a425a7140818dcd8a410d9fdd65f3c5ae11a7048699b4
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'leonvi.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=principles+of+polymer+processing+solution+manual+pdf PDF link annotation
    • http://dragonflysagewellness.com/90200534322qecmv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_601bdd295efc9.pdfIn PDF document text
    • http://prod-fruit.space/electronics_all-in-one_for_dummiesia0eu.pdfIn PDF document text
    • http://technodom11.com/strategy_tactics_world_war_ii_pczwar4.pdfIn PDF document text
    • http://putededojijubo.iblogger.org/75367452273.pdfIn PDF document text
    • http://bigmagazin.xyz/vocabulary_for_toeic_test7diuo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fe74e4929ee0.pdfIn PDF document text
    • http://zoneeuro.pro/differentiate_between_workbook_and_worksheet_in_excelx2bcp.pdfIn PDF document text
    • http://detodefinedex.22web.org/xukale.pdfIn PDF document text
    • http://wasukowoko.iblogger.org/2007_chrysler_sebring_touring_manual.pdfIn PDF document text
    • http://stav-games.ru/nuance_omnipage_ultimate_user_manualod0jk.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/suximawo/elements_and_their_symbols_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/format_code_android_studio_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/comparing_paleolithic_and_neolithic_eras_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/24_auxiliary_verbs_list.pdfIn PDF document text
    • http://nimozan.epizy.com/consolidation_reporting_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/rezorofulib.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_off0000b5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F3 5576 bytes
SHA-256: 2a3e5822e6960514fdd01a8f724615cc3ee5b0459cc3484eefc2cc40796e2741
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 8912 bytes
SHA-256: cc11d5f6413fb96251650dd93deee9f572bb080c41e4482ae06efe5bc75b321d

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