Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9d896fb07252e2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 11:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cba1f93c4c5c327867e9b26541663899 SHA-1: c1f670c68d93dfef07a40ac753b982e6304be07b SHA-256: ff9d896fb07252e29543e0686d6932d7987f708d15c3fc6c985bca49d7a172f6
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with at least one identified as a phishing URL. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/123?utm_term=nalidixic+acid+davis+pdf PDF link annotation
    • http://bomawowaziwan.iblogger.org/38128572986.pdfIn PDF document text
    • http://luvetikemo.66ghz.com/jikogemananuderikofaz.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/zisewaxidoj.pdfIn PDF document text
    • http://pekuxareja.22web.org/46662416751.pdfIn PDF document text
    • http://pufimabakep.22web.org/85049901864.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://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_b5419edd423b48ce93db70e6a2a6ef84.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_98e3c9fca4764ed18f9827b35834e7ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7b21f6-cca1-43f2-a07f-cff247d64c1a/wimisikubolomorifes.pdfIn PDF document text
    • http://motuvogipe.onlinewebshop.net/makerere_university_undergraduate_fees_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6e80f9-c029-40b1-8ca3-7ef275f5ecbe/wokutejepat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d9a0ee-86dd-4474-8ae0-52c220ec0696/2003_ford_focus_se_specs.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_ef36365ea3094530bc3a5b6023f1cfdb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/74574398878.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_937bfca1e0764cf2a6c4c4370313d77e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39780e68-b073-4eaa-8c91-66ef916c6cda/furemukalu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/vector_brush_cdr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9e92ea-6451-4783-9947-59039e719dfb/what_is_descriptive_quantitative_research_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16035ecd-79ab-4f1a-9825-9b5b2f86c751/31943140750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355e1987-b423-45e2-a00a-43cbd9b01093/26128898122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac96d9bf-4ff7-4933-9c96-2a7f791b0914/finevabovusurefile.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_ecac5101debd44dc8deeb84044604571.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e762a6-fa62-48bd-a838-3ae619001d20/1_dm_cuantos_metros_tiene.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 4524 bytes
SHA-256: c34ffa927dff68591f58e265a494b7bc8191808f75ddc9267a5834976442fe28
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10764 bytes
SHA-256: 6612a4b01edbce8c4470430e12161f8fcd4fc8fc9cd35b209842793b4b80e140
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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