Malicious PDF — malware analysis report

Static analysis result for SHA-256 223c8b4fe16de2c5…

MALICIOUS

PDF

45.5 KB Created: 2020-10-29 07:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5b017b0d2ebcb56225ea20edd9f6e97c SHA-1: 1517b7d63d5abda57e3d14418834869f31dbda31 SHA-256: 223c8b4fe16de2c54000e4d8a2452801e19e03c391e6a454a074031cc3f39818
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links to other PDF files, indicating a link farm. One of these links directs to known malicious redirector infrastructure. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://gettraff.ru/strik?keyword=ministerio+de+la+mujer+adventista+espa%25C3%25B1a In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5f95e65b420b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f934e1c5d69b.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/1072509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8b39bbd69a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f8b41ec5a484.pdfIn PDF document text
    • https://wijisozafepu.weebly.com/uploads/1/3/4/3/134356417/kotekulitiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8bcd81ed594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f8f844786961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f88daeb0fb51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8c1178d1d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8eb9a044129.pdfIn PDF document text
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/951595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5f9675af54765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1128/2840/files/27625109320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f58ae1d-0cbd-4619-9eaa-a027765b311d/92251776893.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/public_policy_in_india_rajesh_chakrabarti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3920/7836/files/mizunupabun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6200/1301/files/jeffco_calendar_2017-18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18c5858-5ecd-4578-aae0-cf8d0141d1a0/fisawizutigatemo.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/simple_audio_amplifier_circuit_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/2952000092.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A69 5460 bytes
SHA-256: 2cdb7e39e04c14aaa4fcd3b6664dcf5722b42f9490749b9da0003ee33a901e8e
font_01_sfnt_off00006caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAF 11100 bytes
SHA-256: 4186126855b6a92a2ca260eb5723f9e106897734e3d1269d444d71c394f9d400
font_02_sfnt_off000090b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 16224 bytes
SHA-256: b422167e406e14456d8c777e36f465b0cf7a3429615eb346a55b07892fc128e1

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