Malicious PDF — malware analysis report

Static analysis result for SHA-256 1115d8708d5cb113…

MALICIOUS

PDF

86.2 KB Created: 2021-03-23 17:38:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 658173b68e541b9569cfa45e235f9b3d SHA-1: ee6b2d912779c2d647c0679cd1cdadca0a1b359e SHA-256: 1115d8708d5cb113364af6557e72726aad4faf35117b86cdf204e95900db2c74
126 Risk Score

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 0.9990

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=family+of+functions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401976/normal_60026762c2942.pdfIn PDF document text
    • https://cdn.sqhk.co/luluzefob/097yLgf/rcuk_gcrf_oda_guidelines.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/spoken_english_course_in_bengali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fc96cf2aa2e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_5ff4df884fd5b.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/hgKoNza/best_free_zombie_defense_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_601a9a42ebb98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_600f58bebe9c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5fc7600bbac5a.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/ragovegobeguzefufamuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_60570c007de66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5fe2f93db3485.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/geidsRu/xekizixojodawamegugajuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ff5a224f2adf.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://s3.amazonaws.com/dinilederu/bse_trading_platform.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_c916aa88e7df443399f500df710ce4c4.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_e839a55053404352b2901112befef8b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/19387392093.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_491895da659f41e3a291842aaa32fedd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purawuma/misagogoduzuwuv.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_fcfb61e304a446b98ccd6fdf5f6bcf5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/63110099417.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_f8ad5512747f44e4886ede44694d63db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/where_is_our_lady_of_the_lake_college.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_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 4752 bytes
SHA-256: 2bfafbad526b273047923e1428e7c51135243104727a49e5717e04dbdc5df221
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 11064 bytes
SHA-256: c3efe880e2243b6576ff49d6be89e3eb168ac9c98dbd1c8ccd5b30135c66f741
font_02_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361