Malicious PDF — malware analysis report

Static analysis result for SHA-256 105636af76d37110…

MALICIOUS

PDF

111.5 KB Created: 2021-03-25 15:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e51ed2503e645efb2d700d6cb80e4d06 SHA-1: 8ffbf6fa3c426d46963772fc1f35e6477460c791 SHA-256: 105636af76d37110adb5192d1d6c396d22d7cccff45df3096e4402ccf3679dd1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/award?keyword=aldo+leopold+sand+county+almanac+full+text+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5fe3a17e50b2f.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/gedusafonemejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_60218a097923e.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/nigavaxi.pdfIn PDF document text
    • http://nilanudid.iblogger.org/lidokekijokogiwuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_601b86ac48f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d74fbfc4d.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/8860387907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikupamipevow.rf.gd/juzemusudakikezajudimokug.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_c6c6e9f6376942c89b660c0444984c31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ca75ea-f7af-4d69-b697-6a94c3cf9f4e/28845051393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac2851b-75c0-4149-91a7-b2e7912e3cff/xufanewamutakigowaga.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_addae64d46ce437fa6867bf15319c678.pdf?index=trueIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_15eaaff859584f93b99ecb15eebf81ac.pdf?index=trueIn PDF document text
    • http://xamukipadu.myartsonline.com/jinenanada.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_934034db0e6847c4a4568d2f6053c4d1.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_2cffb12bf5dc439c9e598fe5390817d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b3a7c0-b20a-46d0-83ff-5b6aacd2fa23/69225075284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e53796-b54c-4aee-a9eb-18926c9aafc9/how_to_fix_kenmore_washing_machine_agitator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 24136 bytes
SHA-256: 811a425e808f81c8728bbe599f9be2c2f04dd255e1d7d34f2d9c75efd914ae4d
font_01_sfnt_off0001733f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733F 5364 bytes
SHA-256: 85a7807c8aaa23f9478ecd36dcdba5e48674515501fb9d4c312201052312b037
font_02_sfnt_off00018583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18583 12800 bytes
SHA-256: bdb0e3248ef9860e64dd2c57de285028007f53de83f801fc54f96b145a19c8b7

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