Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63ad0650f7f7d5c…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 15:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c6afe7240f25670c1b797d300a62e58 SHA-1: 42811cc1b1e53a462a678bf24cbe9b900568ed67 SHA-256: b63ad0650f7f7d5c4917eaba1d161f137520382aab0ff859514e05ddbe087164
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://nipisod.ru/strik?utm_term=mamba+elite+size', likely intended to redirect the user to a phishing or malware distribution site. The document body contains obfuscated text and metadata suggesting it's a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=mamba+elite+size
    • https://cdn-cms.f-static.net/uploads/4445532/normal_602717ad1e0ee.pdf
    • http://vkysnaya-eda.site/phrases_describing_the_sunsettswjf.pdf
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5ff8445202677.pdf
    • https://cdn-cms.f-static.net/uploads/4375095/normal_602f0b0a5f59f.pdf
    • https://cdn-cms.f-static.net/uploads/4421630/normal_601259b4069b1.pdf
    • https://cdn-cms.f-static.net/uploads/4458145/normal_6013c35cbe044.pdf
    • http://yourlivehelp.com/815734941044c6gm.pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_603d1f946b6f7.pdf
    • http://polnews.xyz/ancestry_tree_gedcomvb6l5.pdf
    • https://static.s123-cdn-static.com/uploads/4417315/normal_600580d53e7d9.pdf
    • http://sallehq.xyz/rixugagezusmj0.pdf
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600ea2631dcb8.pdf
    • http://cadenalia.com/68652752104bbbqb.pdf
    • http://naturwows.space/bully_max_high_performance_ingredientsiqu8o.pdf
    • http://ig-socialmedia.xyz/butanaxunanuvorbbynl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jefazaxal/g_shock_gw_9400_amazon.pdf
    • https://s3.amazonaws.com/kabisebax/sheet_street_comforters_south_africa.pdf
    • https://s3.amazonaws.com/solonebosop/apache_openoffice_4._1._5_free.pdf
    • https://s3.amazonaws.com/jepinebawo/amped_five_manual.pdf
    • https://s3.amazonaws.com/sojenozap/que_es_un_caballo_de_troya_en_informatica.pdf
    • https://s3.amazonaws.com/nitajosasa/daxanezuviwesepidev.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_off0000f7c0.bin
ad1ae6c2bd2165d90e968eb578712ab8c9014e54f358f74e1c57b6f9c8d4c9fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 4932 bytes
font_01_sfnt_off00010886.bin
5791b3ba8e4e67aea10f4782c1a4df6c6a4689580145c0f32603ba02baa8598a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 12356 bytes