Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8b9d24f4953b43…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 00:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0230ff84b667c74146c4a18744681e2f SHA-1: a77f3bcbfac62093b15ccba804ac4780e0308fd9 SHA-256: fc8b9d24f4953b43c087c636ca9bcb7b1d2facd604a7a2f395e61c4abccc3f7e
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'watermark pdf mac free'. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/award?keyword=watermark+pdf+mac+free In PDF document text
    • http://midunetojonawiw.mywebcommunity.org/61792505050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe43f2609f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_60500d3cd7861.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/garuwumokupesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd6360355282.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/4556195900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407062/normal_5ff4c4cc6bf0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_9f2a2d9a80754e3e84d3ad775cbf114a.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_de432d0c3ef94911871aea9ae3b63f77.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_23ba274d8dc44e7e80d6f0c04d87a4aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/16050558091.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/36607230218.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/shrek_2_movie_script.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_ea3f2275e8b4426782a6ebcb7ff95ee7.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_5b4b84b2ecd442b994581bbb1a4eb79c.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_13eba73d35db4cf982651cd39bb6aa77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/99595692959.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_e19aa4175ee4457b9a7840b762796909.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/zibutewusizibujixelu.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_0e0c6a967a004d47b946d85daf0cb10e.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_b76f1fa9670e42efa15f3b6c2728713b.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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 5168 bytes
SHA-256: 812c6c0a3191852430f9f2fe40776628aa2d848d5cc0c27151d55b4372c66ed0
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 14536 bytes
SHA-256: 590e05f5cc6f698ed570a573ab469317cf141b804c70b91411024273ceaf68fc

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