Malicious PDF — malware analysis report

Static analysis result for SHA-256 4316820bf082f632…

MALICIOUS

PDF

68.0 KB Created: 2021-03-17 04:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81d0942d4d5d0d84e3344199499a519d SHA-1: 11f3ebd167d35238390e468a4574fd81c658ff32 SHA-256: 4316820bf082f632b750d601dcba07002c594c5cd96f9c0bb7851c00048856af
186 Risk Score

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/123?utm_term=cessna+150m+maintenance+manual PDF link annotation
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/4811844.pdfIn PDF document text
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/bidimanitinowimimos.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/60d0fce6360.pdfIn PDF document text
    • https://sazulolako.weebly.com/uploads/1/3/1/4/131453808/5022744.pdfIn PDF document text
    • https://nazixusa.weebly.com/uploads/1/3/4/3/134363102/9521098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_0796224874204fedacb824a35e65c2af.pdf?index=trueIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_2d17a028e56d45ca90125a16feed0870.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f7e21d-beec-4d81-8ca7-beb7a1e4f8c5/soccer_shooting_drills_for_high_school.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_93cd61d697b74cb9bcb696a1acb8ab6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b09f29-caed-4e98-8a07-8e7c7636c9a9/gun_cabinet_plans_and_materials.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_e1d93f18651240778619bb9c9649a6c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee1cd9e-3e65-48bd-9a0f-256524dd9c99/66244235400.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_0e32f34e97204307bc5905e5abf5ee6a.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_2b24a1ba460d4fc0a55c52fb311e5693.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_24e7fe6c2f5e48878f40098732e13ebf.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_3ff951f969844cfea20245f3bed82a61.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_9f1e2018a884406abc3c852e2a66061b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 4964 bytes
SHA-256: 84e5b688436b19c6e7ad14e696f65379f74dd9d7fbd268f72ec3e600c3886f41
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 9672 bytes
SHA-256: f31a4d41fa06e3116a054bbfa0426afe0ceb8592e2d680902c8dd019f6240e14
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176