Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5364d430db6a1d…

MALICIOUS

PDF

70.8 KB Created: 2020-11-14 05:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 89cf2dddd46d8e30405ab9026e3090cc SHA-1: 973a85537fb4d1c75d917a9211c886369681da90 SHA-256: 4a5364d430db6a1d003d907ca817333bae2e8e096029abf4cc4ed4a4aec842c0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=citing+a+speech+chicago In PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/firawu.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/9791970766.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/capriccio_24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1001d929-7ce9-483b-a837-f039671dd36c/93408796031.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/carrom_rules_book.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/37180985708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3e9427-067d-44c0-b4a6-62680fe6c2f4/nadozumiginibabo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/wugokatawoj.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/bankers_adda_current_affairs_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1388b741-7c66-4b0d-833c-c3e004459b04/que_es_la_teoria_humanista_del_aprendizaje.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/free_hd_movie_downloads_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abcdeed-3239-475d-8c6b-67f14bb2d74d/pizikubesolopirili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0035f07-43cb-4e72-9216-b8d80ffca1fa/rasudugaziruwuwovagip.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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 4972 bytes
SHA-256: b7bea7fb6e1dffb2ac1a673e0cf713899e1bfeba64176f52b66c71bfa42f8bf0
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10744 bytes
SHA-256: 87f7800fd3f28921fdcfb2c47b60c67fbe1216925f9312c9cecc98eee5a37933

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