Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddd4ca0f85a5fe6…

MALICIOUS

PDF

78.9 KB Created: 2020-11-12 22:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7514d9bd4a48c5d27e364466ba374346 SHA-1: 095e3bd72af4aafbb30a322e2a12944196dcaf4d SHA-256: bddd4ca0f85a5fe67b975d19be004748e82c20171b477692f8f9b0d06443e8f8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/aws?utm_term=brandenburg+v.+ohio+pdf PDF link annotation
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/854c3d193b527.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/85f5a0.pdfIn PDF document text
    • https://kozesetod.weebly.com/uploads/1/3/4/5/134507136/6522274.pdfIn PDF document text
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/bokosafijima.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/punuserenum_nosobuvar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11759c96-6e69-4d2b-8580-2b1c356286d8/what_squared_equals_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5089c499-dcb1-4741-a37e-8b0ba2872dea/jepudasijatodilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16df857-99f8-4948-874b-4b09f277039b/megodinutusazudarir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81946dc-38c5-41d9-ae6e-5c9aeb515f34/nebunafug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7edca8-5416-4089-ac80-b5224ccb4c69/deveverokopipakominomep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2b1992-524f-40c8-8710-0ecd5b54c482/48590796916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a289e58a-90b2-4677-928a-7864486622a0/all_pets_in_terraria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a5aa47-6f22-4f70-9aae-7400d73a74cd/watch_free_online_underworld_awakening.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_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5376 bytes
SHA-256: c783f3b5e37f30a42038fb292611324f78cc7e32b8e10cbe6bb62baba9869833
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10992 bytes
SHA-256: 4bc6eb22e7dd22a018633da57461cc0bccb4d23601d2bff421a577cdd03deb3a

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