Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbe280cdb51cecf…

MALICIOUS

PDF

75.6 KB Created: 2021-02-21 08:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d8318c5c02616ab681d5ba2953a570d9 SHA-1: efee7f8b4401780836d20326887dd1029b4a9f35 SHA-256: fcbe280cdb51cecf1ef8a2674cf3822495f99a45dc90f9e49eee8d04dd33a95e
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to an 'income tax calculator spreadsheet', aligning with the SE_INVOICE_LURE heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/wix?keyword=income+tax+calculator+spreadsheet In PDF document text
    • https://cdn.sqhk.co/wifavizen/2qhUfNx/tapixukamijogexogabibope.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/3ghRLjg/rotation_control_android_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/icUhhgi/war_in_the_streets_reach_the_glory_lyrics.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/wamuboa4v7o.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/ijihfgi/77832491783.pdfIn PDF document text
    • http://usejus.club/formato_ebook_kindle_firengtws.pdfIn PDF document text
    • http://fito4ka.xyz/surface_area_of_a_cube_and_rectangular_prism_worksheet9nzdm.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/dihgiRi/68746111651.pdfIn PDF document text
    • http://zabumufunesomud.66ghz.com/49253610008.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/wizomoravazub/63899506815.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/56436027173.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/realtek_hd_audio_manager_right_speaker_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/chrome_full_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/vinag.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/windows_10_1809_update_assistant.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/xamajapoxamosix.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/biguwojikasofapugiwas.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/51389159695.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/83464853188.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5320 bytes
SHA-256: c567bc03065512e9c7e6f401f8eac6c872ce34da033858b1f9f61b2e47664562
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 10736 bytes
SHA-256: 9d8b631791bba9aa756fdbdd946ab99a4ffc86d371e925360ccb74e855550175

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