Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3f6abe4a55c159…

MALICIOUS

PDF

73.3 KB Created: 2021-02-13 21:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fea50d1659c969c0a233a5d116df4740 SHA-1: dbdd794167cbe982ac646ef5859b37053808e7f1 SHA-256: bb3f6abe4a55c159c95bdf3e3de487eb57cbac32425455760ab3a09cf1303551
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a heuristic indicating an external URI. The embedded URL, 'https://jottigo.ru/wb?keyword=insert%20excel%20spreadsheet%20into%20word%202016', suggests a social engineering lure related to document manipulation. While no scripts were explicitly extracted, the PDF structure and the presence of external URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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
  • 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://jottigo.ru/wb?keyword=insert%20excel%20spreadsheet%20into%20word%202016 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366317/normal_60028f50b906a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5fe1eb943faa1.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/ZY6Vs8k/16186267956.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hCjdhhf/nokijapudumideja.pdfIn PDF document text
    • http://classicalnaturally.com/69072056326wqg9q.pdfIn PDF document text
    • http://usese.xyz/formalits_vente_d_un_fonds_de_commerce4koag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491669/normal_5ff4a63ba1d5c.pdfIn PDF document text
    • http://socialwave.me/linus_and_lucy_piano_musicqmlfv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_5fe7a36b6e4dd.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/CCPjate/frantics_similar_games.pdfIn PDF document text
    • http://winelorasagi.22web.org/tomanupujidowavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fd6780138763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365560/normal_600101dca9ee9.pdfIn PDF document text
    • http://paksorond.xyz/mariage_d_amour_chopin_piano_sheetp8d0w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fdf39ff91436.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/vjfCkge/64803541776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc977fe60d05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matogidujizovoj.epizy.com/diamond_shape_worksheets_for_toddlers.pdfIn PDF document text
    • http://forolulazo.rf.gd/axl_tamil_movie.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5740 bytes
SHA-256: 5fc3a80e4067f9d03a4b84d11f7e126e8499a9f7b2df946e47adc1f22e7aa9d7
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10664 bytes
SHA-256: 075810710d1cce43a4643750083d3a2ccc1f8a15108b93b1019c43b65ca111dd

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