Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bdbe993af2b2a5…

MALICIOUS

PDF

73.3 KB Created: 2021-03-17 19:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9a3cd2625f69b4231b50145243ea4aa5 SHA-1: 7ee880675f2efd2b9f764f3e38647ee3ae66e2f4 SHA-256: f5bdbe993af2b2a5ec1eadc51240a151af8f186284ef813cdebaf2964f4081e6
156 Risk Score

Malware Insights

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

The PDF file, disguised as educational material, contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV detected it as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://midufefew.ru/123?utm_term=phonics+worksheets+2nd+grade PDF link annotation
    • https://cdn.sqhk.co/togixulala/jIFjhia/24244663782.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/Ogieghc/93795476238.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/qihhco7/kebadebe.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/KePjiQD/57378404634.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/jsKI5Rf/mysql_server_remote_access_enable_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_6f3c1aebae104dffa475807e6f2ff3e3.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_1074378a58804138a20fd793872ef5b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/muxigegemetimuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b072cb-e389-4c51-a4f5-75ccc3bb531f/how_do_i_invest_in_money_market_funds.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_82713c45ef544bffa5aa53f098ea288b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/nukidupasapovuzorutamigu.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_a8e135a86fa8417cb5c891c915ad60ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc30697-9b7b-4c1a-a629-4b8856404b9d/kowaxivuzuvumizumuriwazo.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/wifi_booster_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/begum_jaan_full_movie_filmyzilla.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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 5460 bytes
SHA-256: b35001baff6e45673b1c8a1973f3d05d1e6c08633059a420dda2f81af1f90bc9
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10896 bytes
SHA-256: 72c24d77b569ec90c58dc4efe417c717a9a09b3d0aa76a2ec5b06ffb8e993ae8

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