Malicious PDF — malware analysis report

Static analysis result for SHA-256 121bdfaeefe35ab1…

MALICIOUS

PDF

67.6 KB Created: 2021-03-25 04:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90ce0934e78a642290a3842e348247c3 SHA-1: e122aae313e0ede7d748289a910b5fd4557b97ee SHA-256: 121bdfaeefe35ab1f3373ebaef75fbd310f17f1c9c63fe26cf2ea8783bfcce9c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=calories+in+a+sonic+oreo+blast PDF link annotation
    • http://wurogutevifo.iblogger.org/silajavek.pdfIn PDF document text
    • http://bachanalytics.com/quien_es_el_libro_sagrado_del_hinduismoww7uz.pdfIn PDF document text
    • http://mailedflkf.site/851373015702g7dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libejejizu.epizy.com/64462284898.pdfIn PDF document text
    • http://bolekatu.rf.gd/how_to_use_apple_imovie.pdfIn PDF document text
    • http://fesifudojepaj.epizy.com/15727432488.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_1c7787265e44454daae0238450fc4e63.pdf?index=trueIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_d1742ffdeb354b638aee3c678f2ea471.pdf?index=trueIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_7b42c9e0f0d04f44b4e6aa8733572bcc.pdf?index=trueIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_7a456d8fa52b44a88cde691a582e7c49.pdf?index=trueIn PDF document text
    • http://ripofosefalub.rf.gd/bin_file_converter_to_mp4_android.pdfIn PDF document text
    • http://wuzuferopo.epizy.com/76179693496.pdfIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_128dd52d7b4f4f3c862b1617590e674c.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_232e80f89ac74369bfb9943d52856f6f.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_5d657184aad24d098658a96d7fc94508.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_82e418cc142444208758d975c58df053.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_00f574a27e4446bc866a2200672b6543.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_e359654680de474baf15ac488cd5d92b.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_ad90f133b30d4247b2deb54b336e59c3.pdf?index=trueIn 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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 4836 bytes
SHA-256: 5fbd3ee302932f008fd247af5ebfa9807067ce4a82b44090f749000aff6ca7ed
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10444 bytes
SHA-256: 1b41c4972f54d29419b330e6ba0c56addfa33cef585b23e4bed0e3ff6d027ce7

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