Malicious PDF — malware analysis report

Static analysis result for SHA-256 526627b0bdd51177…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 08:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec97dfdb481e3056065df43ac279e6d SHA-1: 2cf16452a2997fd62c54ed637d0b32977be6edc8 SHA-256: 526627b0bdd511772daf2365a409cec7491febedafd69bd9cb137312f7d9df15
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing campaign to trick users into visiting a malicious site. The document body, though heavily obfuscated, appears to relate to 'free books onto kindle', a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/123?utm_term=free+books+onto+kindle
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fe413092fdaa.pdf
    • https://static.s123-cdn-static.com/uploads/4390663/normal_6004b952d4a26.pdf
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fdd42698c171.pdf
    • https://cdn-cms.f-static.net/uploads/4503791/normal_60500d1361507.pdf
    • http://fiwazurenorin.iblogger.org/39101813335.pdf
    • http://kozaredibedemok.iblogger.org/18712140113.pdf
    • https://cdn-cms.f-static.net/uploads/4500678/normal_6064cb6b0d876.pdf
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5fe8de350255a.pdf
    • https://cdn-cms.f-static.net/uploads/4366652/normal_6048250daab24.pdf
    • https://cdn-cms.f-static.net/uploads/4471481/normal_6011ab8c5150c.pdf
    • http://soldatskaya6.ru/52619537698mzb7f.pdf
    • http://ovca.space/tipiwirez0a5ey.pdf
    • http://javebamugizal.66ghz.com/48105254114.pdf
    • https://static.s123-cdn-static.com/uploads/4426263/normal_600087c52f658.pdf
    • http://idealica-columbia.site/tarumurikopawovimaxikujvwx1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuxufotab.epizy.com/tosinisozoxeboxusu.pdf
    • http://bategozejaxa.rf.gd/vifazufegosu.pdf
    • https://s3.amazonaws.com/jadere/vejoxazizudazimisewotu.pdf
    • http://zuraravata.epizy.com/bryant_plus_80_furnace_air_filter.pdf
    • https://s3.amazonaws.com/poguvelefa/how_to_reset_waste_ink_pad_counter_for_epson_l380.pdf
    • https://s3.amazonaws.com/luramamelolem/new_bodo_song_now.pdf
    • https://s3.amazonaws.com/xasovewipeje/59753930505.pdf
    • http://ninesunugata.epizy.com/78675740953.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb18.bin
fe8f4638bbc373ec40377dec57b3f5ad8804c8a78abc2b006d6c9a479725fc2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 4768 bytes
font_01_sfnt_off0000fb5d.bin
730bddfc0066b1e37470419e0218a6b9895c7cd8dbfe6e47b8138d361eae6b84
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10920 bytes