Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f2598a15caf312…

MALICIOUS

PDF

85.7 KB Created: 2021-03-25 17:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5a9cad80d313f6f936300ff2a517d71 SHA-1: a9b53a868a8c53237eed775a75472e0e69b12ae4 SHA-256: 90f2598a15caf3128be25f88a185f482f462bd00ce45f682cedf2d5ee07372ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The presence of ClamAV detection and a high ML classifier score further support its malicious nature. The primary IOCs are the numerous external URLs embedded within the document, which likely serve as the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/123?utm_term=ldap+injection+hackerone+report
    • https://cdn.sqhk.co/figegixo/h5Igigj/62135869222.pdf
    • https://cdn.sqhk.co/sexuzoropa/OLjjH6N/dokup.pdf
    • https://cdn.sqhk.co/safovokon/Rgjicij/ordinance_synonym_list.pdf
    • https://cdn.sqhk.co/fatidizeru/jvgggcv/srsd_writing_model.pdf
    • https://cdn.sqhk.co/lebogomatoze/jggdjfz/fiwemofagogimilanovo.pdf
    • http://tonagruz.ru/ninudotehmrr.pdf
    • http://hookup756.fun/wadawajizovemakimms5ry.pdf
    • http://serviceforyou.site/examen_final_matematicas_3_eso4xwvk.pdf
    • https://cdn.sqhk.co/xaripisi/fgfbhdP/jegorapanevi.pdf
    • http://tazizinujumijoj.mywebcommunity.org/enfermedades_comunes_del_sistema_endocrino.pdf
    • https://cdn.sqhk.co/folamudoj/U6iehjQ/fisuzunem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_2a8c8afae5094736a251bdb43f42232b.pdf?index=true
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_445ded0d5834449b837be491e0ed1533.pdf?index=true
    • http://wenares.myartsonline.com/3sge_beams_manual.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_ba9fef39681d4014ac577ca26f73dce3.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_66109b08b89040c6a84a0261cfcde8bb.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_b38221501da24a429afc7b7150724fc7.pdf?index=true
    • 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_off00010307.bin
f13111fbfa0ddee14a3da466fb77b4d61a00de2f4375b9236d7f85888f57a6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 4820 bytes
font_01_sfnt_off00011355.bin
396021fb1e693ebadf025024a268cd6e6d7e7fa54b622010c666b36abc60f45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 11932 bytes
font_02_sfnt_off00013985.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 4324 bytes

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