Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fb6ec61fbede8c…

MALICIOUS

PDF

80.3 KB Created: 2021-02-27 08:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6dadb1563b3da5737d98d3fe97b1ce49 SHA-1: c30894308c49d2a29a33296e4b43481c61654bac SHA-256: 88fb6ec61fbede8c52167045fbd546ac8c1c3ddd06f88c89dbbded514f02ffed
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, suggests a lure related to 'Problemas de porcentajes 1o eso' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=problemas+de+porcentajes+1o+eso PDF link annotation
    • http://ketosimple.online/641807462171cu9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_601b2effdd1d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424933/normal_5ffe6d3fb4984.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/SRB7igQ/38055400618.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/ja0VnWI/planetary_annihilation_legion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_6039974e91445.pdfIn PDF document text
    • http://glossywp.online/free_download_of_schubert_ave_mariaypzgz.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/TfjhH8q/war_sound_ringtone_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6019ca49838b6.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/88459776892w4k72.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/JnihKm3/13537665390.pdfIn PDF document text
    • http://islta.fun/470092360239mbyg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_600f3ee7304da.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/zibenoroduzuw/pululasowoguralezixuru.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/dogej.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/tafoxudexo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/2017_buick_enclave_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/28132238466.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/85314699743.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/758183933.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/86386685983.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5228 bytes
SHA-256: 8986447edd0c6a454917664f3d11db0bea5016b6da0d960109728aaf7e99a30d
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 12516 bytes
SHA-256: 978c8776e23f95cec611ebb8b8209f25651194294f59f49f697ae2c61fae0023
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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