Malicious PDF — malware analysis report

Static analysis result for SHA-256 31757a619f500906…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 00:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0ed8e998bbc8f39201bc46d7ef0c2ef8 SHA-1: 0deefcefd4c5708241875cfdefacd35a58b9528a SHA-256: 31757a619f5009065c3fb35b5defccda4a0248aa11afab2156fbfe5ab278821b
96 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to "The rime of the ancient mariner summary part 6" and the authoring application "wkhtmltopdf". The primary malicious indicator is the embedded URL pointing to a suspicious domain, likely intended to deliver a secondary payload or phish for credentials. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=the+rime+of+the+ancient+mariner+summary+part+6 PDF link annotation
    • http://erogan-encolumbia.site/zopobifodakamukilizuzupivymfxj.pdfIn PDF document text
    • http://dom-bita.org/diary_of_a_wimpy_kid_books_in_order_1-13e9ssr.pdfIn PDF document text
    • http://pidukefap.22web.org/nunexixekawakuwepovefinu.pdfIn PDF document text
    • http://worldworkbook.com/introduction_to_economic_systems_worksheet_answers88wth.pdfIn PDF document text
    • http://kodesurajevo.iblogger.org/hepatitis_c_treatment_guidelines_easl_2017.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/bobozuzevofazifiliwafu.pdfIn PDF document text
    • http://mstmail.space/13597127861non6t.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/31453118276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38decd67-2eab-4a9e-ba55-908917b123aa/vibuzekatib.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/mabelevewidumoxipi.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/ximibabenatozixegukawugut.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_400b0bf227c24574af9cb24ea5a40dcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/49182962580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d555c129-8aba-4e5c-b10f-08d946c69fd3/how_to_use_countable_and_uncountable_nouns.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/a_court_of_mist_and_fury.pdfIn PDF document text
    • http://loratozojakin.epizy.com/wawelomuwewugezujadam.pdfIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_6d0a5ab57a5a4c65939f45518aa781b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/cryptarithm_send_more_money_answer.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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 5428 bytes
SHA-256: 18dc8d48d96a3f7ff96aecd45b30bd1b6ded2455e8fa4395d59158e95451af5a
font_01_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 10560 bytes
SHA-256: 082b221e740962af1882d3def18342cc318cc4be132bf943d01b88d7a9db2a4b

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