Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ad326da8d053e2…

MALICIOUS

PDF

74.5 KB Created: 2021-03-16 17:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c3d9c7bb19c3a6c9e4461a2f7f5ac3b1 SHA-1: 0ca1163b0d4bf1ec62b6bd9a76487d70ca1939a1 SHA-256: 50ad326da8d053e2e23b292decf50907c19c3f102379948e4b741abc2cf5dda3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF link farm containing numerous external URLs, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to a project abstract, likely used as a lure to encourage users to click on the embedded links.

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
  • 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://resalured.ru/award?keyword=automatic+car+parking+system+project+abstract+pdf PDF link annotation
    • https://wimafepe.weebly.com/uploads/1/3/5/3/135326366/2259989.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/jHIgfi7/64415563903.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/rakotebivoweg.pdfIn PDF document text
    • https://lejujazu.weebly.com/uploads/1/3/5/3/135337057/924f8f.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/rxgfDR7/8227253556.pdfIn PDF document text
    • http://jonezuno.22web.org/geely_automobile_annual_report_2016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegewamofuxa.rf.gd/warcraft_armies_of_azeroth_mod.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_4b0904cbed824bc5ad0fc06b1c0b5008.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/dezenuna.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/2472977935.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/muvilozepasosufifexofika.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_4821c7981c874481b6668cef92108dc3.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_65904b1e14174efbae1975065c7bde31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/chemistry_textbook_answers_ocr_a_level.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_e3f5aa2907854506a7788a8e3ca38577.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukiza/formal_business_letter_format_multiple_recipients.pdfIn PDF document text
    • http://funakadoni.rf.gd/aaxa_hd_pico_projector_manual.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_a952fba2d8d4452986c7023e64cd2b0f.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_094eb16590ea4e1282134ac3b2638f89.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5812 bytes
SHA-256: 0a080139b3f9219da5a7fb757608eb4fdd6fbde385e977d872419d1a5e45e1ce
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 10328 bytes
SHA-256: e69e93ed400ffdd05075c2d74619138530f928a20bbff2bf03a90750874f7386

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