Malicious PDF — malware analysis report

Static analysis result for SHA-256 414e4fc6fb316e84…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 05:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee357c011a84c76235514022b7d8a51f SHA-1: 7561bef0884e2029889e8ec68facea2c51dc0cfb SHA-256: 414e4fc6fb316e84f969290892fdf30462628944eb05de37f7a03756b260f331
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a tactic to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and extensive external links point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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
  • 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/strik?utm_term=shark+steam+iron+reviews
    • https://static.s123-cdn-static.com/uploads/4449775/normal_5fefa55460712.pdf
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/nejawanepalozerujit.pdf
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5fe47f7778713.pdf
    • https://cdn-cms.f-static.net/uploads/4369516/normal_603e7f7066f4e.pdf
    • https://cdn-cms.f-static.net/uploads/4377380/normal_603cfa0047118.pdf
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/3606306.pdf
    • https://cdn-cms.f-static.net/uploads/4480897/normal_60347e9966dff.pdf
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd6411f5b648.pdf
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5fec21daa4894.pdf
    • https://cdn-cms.f-static.net/uploads/4459776/normal_6037050a400ae.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6036fcff7ade7.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_601c90832565a.pdf
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/1969276.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5fd1fb26ebd85.pdf
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/duvuvuwofixaji-dalirogokusi-wopulomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nezanurugega/14747129992.pdf
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_7bbd0ce7f30942ecbd799e9c6af449f4.pdf?index=true
    • https://s3.amazonaws.com/wajibile/system_verilog_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/dinilederu/sinajox.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_121d3c4a643b4d5995a1749c28141c48.pdf?index=true
    • https://s3.amazonaws.com/wexukufedepim/khiladi_bhaiyya_786_video.pdf
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_85f7122d25394648bbb8bf129c7fe7f6.pdf?index=true
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_198878cb95374d59a3e7ba051b987d60.pdf?index=true
    • 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_off0000f75f.bin
957f7f239a8cf4c1e45b50656338ac677d6a8caa62d416f787246a7dccc52251		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 5212 bytes
font_01_sfnt_off000108ff.bin
fc38eb079e59a92b354f6ab7babba0d04ee883023875e8e6749a5de406fc2e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 11344 bytes

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