Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4598bb90c9798e…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 00:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257bdebf21ec2cc9cf607da9aaa14164 SHA-1: e6535a8df440a4693a1f06d00f7d1648389b5e72 SHA-256: 5a4598bb90c9798ed5e19fb086b82a970c1bf8073379de4d01a03c519f047675
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, https://nipisod.ru/award?keyword=cranial+nerve+lesions+pdf, is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and URL suggest a phishing attempt.

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://nipisod.ru/award?keyword=cranial+nerve+lesions+pdf
    • http://ravinugamajako.iblogger.org/identifying_descriptive_language_worksheets.pdf
    • https://cdn.sqhk.co/xutazazo/Ochihdl/85436068763.pdf
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/dijakufe.pdf
    • http://icily.xyz/138711774257x1jr.pdf
    • https://vatubovelogised.weebly.com/uploads/1/3/4/3/134375195/sawujafujebulin.pdf
    • http://hiziryigit.online/best_bible_app_for_iphone_20198toak.pdf
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/kumolilutenixema.pdf
    • http://1xbet-regi.site/85976718858vplt3.pdf
    • https://cdn.sqhk.co/wofikubid/COiei4D/western_wallpaper_hd_iphone_8_plus.pdf
    • https://losulojer.weebly.com/uploads/1/3/0/7/130739206/xabiwaxakunukorilu.pdf
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/9153649.pdf
    • http://help-feedback-amzn8.xyz/learn_c_programming_online_tutoriallb7dw.pdf
    • https://cdn.sqhk.co/vorebilifi/jtdqAiy/vunidene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ridupokibi.epizy.com/after_effects_animation_scripts_free.pdf
    • http://vulebodifoguvar.epizy.com/ratikuvulurivuk.pdf
    • http://dukidejulorib.epizy.com/biodata_hd.pdf
    • https://uploads.strikinglycdn.com/files/eb49f95b-ab47-47e3-ac36-2ea219bfefd1/95516224376.pdf
    • https://uploads.strikinglycdn.com/files/fdda8c76-f8c4-44fc-911f-306938e102d7/59763874182.pdf
    • https://uploads.strikinglycdn.com/files/4ac3694b-ade0-4762-9305-71fba026de57/ejercicios_de_limites_de_funciones.pdf
    • http://kefelogo.epizy.com/wordly_wise_book_8_lesson_2.pdf
    • http://letotake.epizy.com/79035113670.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb6.bin
6006edfa0025abf085b3d42bdd2c92cb1084efc19ed3cfab08993444170002e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 4824 bytes
font_01_sfnt_off00010026.bin
2c4828865816730ed9b22be9814c59848d4de5d3a42594d548e4e5d466c8b338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10160 bytes
font_02_sfnt_off000122f7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 4324 bytes

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