Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f59ac1115669aa…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 02:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f896c8e3d0fd08d400ca424afc7046e9 SHA-1: 9adb44ccec034189b5df238c06931f41700b8450 SHA-256: f1f59ac1115669aa4e7c56f158ca5901bc298f6527537f325bdcd6f7c8be8d90
186 Risk Score

Malware Insights

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

This 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, directing users to numerous external URLs, including 'https://soxebez.ru/wix?keyword=baby+animals+printable+worksheets', which is likely part of a phishing or SEO spam campaign. The PDF structure and embedded links suggest it's designed to drive traffic to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://soxebez.ru/wix?keyword=baby+animals+printable+worksheets
    • https://pagajunudew.weebly.com/uploads/1/3/5/9/135992687/2c49f.pdf
    • https://lipisowuke.weebly.com/uploads/1/3/5/3/135387266/gezojoper-xizatipu.pdf
    • http://nonowun.mywebcommunity.org/vamugetovotepadatevo.pdf
    • https://static.s123-cdn-static.com/uploads/4483345/normal_60064c17563cc.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/1238407.pdf
    • http://bikokobolo.sportsontheweb.net/24812576874.pdf
    • https://static.s123-cdn-static.com/uploads/4486363/normal_60095ef1d08ed.pdf
    • https://suxavumopej.weebly.com/uploads/1/3/3/9/133999634/solapinujov_bidux.pdf
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5feb013398a1d.pdf
    • https://cdn-cms.f-static.net/uploads/4410956/normal_6050c9e0e6b31.pdf
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5ff9bd91046b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3dd234af-8987-4410-916c-319be13f379e/98093728820.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_cba9a9fa4abd4348b917c2eee5197ab2.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_ee43346d12fa49c195f5f8d601e3d7fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ea67ed2-0dc4-4cb2-ac0f-438c33c8652d/donuwesokidozexasakumemim.pdf
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_807e81dffb2c4cfe920d3cec39a452d8.pdf?index=true
    • https://s3.amazonaws.com/tutasujal/graphic_design_app_free_download.pdf
    • http://vujapoguxesak.myartsonline.com/3740295246.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_df2aa3f0c4334e7f9b1d3c7a1582e7db.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_868c74aa8d2a4c20ad48849faf5cb9a4.pdf?index=true
    • https://s3.amazonaws.com/fexuror/apartheid_laws_from_1948_to_1994.pdf
    • https://s3.amazonaws.com/sefiwegegagu/42346868684.pdf
    • https://uploads.strikinglycdn.com/files/29764e25-c5d1-4848-a0da-0613a06259f9/how_much_does_a_regional_manager_at_planet_fitness_make.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaa.bin
bede450347be3737a23ee8a1c3322ea907214fce8f9c7009639ff38da5910dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5504 bytes
font_01_sfnt_off0000fe49.bin
c0c69afaa89917e2cc1d2f18c716137aa4f29c1f904e29337734f324a5a7a732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10652 bytes

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