Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cae7577bafb9c72…

MALICIOUS

PDF

76.6 KB Created: 2021-01-24 22:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f2fac006427d2d5e25d6bc25dc1928de SHA-1: c7fd71bbfb7fea95e8c024f6e68904596c2ae8c8 SHA-256: 8cae7577bafb9c728a9eb3d92774f46c5994d157840b66894bf6a0d917b50574
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, suggests a lure related to "Kanna hyper stats guide". The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/123?utm_term=kanna+hyper+stats+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5fe8bff12f076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_5fdc027de3bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5fec73680e.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/hK8gfhg/zombie_themed_party_invitations.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/blVhVzk/kingdom_new_lands_dog_stolen.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/i824gig/mibofagux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojivudotafaf.epizy.com/honeywell_round_digital_thermostat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/crusader_kings_2_beginners_guide_ireland.pdfIn PDF document text
    • http://lojupefiduk.epizy.com/c_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/virus_herpes_varicela_zoster.pdfIn PDF document text
    • http://titomozuluvexov.epizy.com/demographic_data_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/chuchu_tv_kidsong_free.pdfIn PDF document text
    • http://nufolupi.epizy.com/xibamivomixerimagal.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/pexoxuludapebusajef.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/zelukurelitewafamorefowok.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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 5260 bytes
SHA-256: fc9aad8163f543ece04e27bf3228ea5cce0e72be6f940db3fb1712485cf7a19c
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10468 bytes
SHA-256: b94c03cb93f0ba4860abd635b75986e2579513f3250b5f186b99e6b6ed889eaf

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