Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f633ee905fe2641…

MALICIOUS

PDF

71.5 KB Created: 2021-03-15 08:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb32508934660af70652b018ce52d07 SHA-1: 262a485d4b3de4bfcb4a6ee7fafa13fc0493e1d9 SHA-256: 7f633ee905fe26416fff7aab787b361addf1e500b30060dee0ad1d8245653bd1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is used to host numerous links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://midufefew.ru/wix?keyword=economics+principles+and+practices+crossword+answers
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/dokekolajobobuk.pdf
    • https://cdn-cms.f-static.net/uploads/4415767/normal_601b7e7a9d195.pdf
    • https://static.s123-cdn-static.com/uploads/4453906/normal_5fc859d0d564e.pdf
    • https://cdn-cms.f-static.net/uploads/4379035/normal_6028e8718b5d3.pdf
    • http://vurejowug.mypressonline.com/advances_in_behavioral_finance_volume_1.pdf
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fcfac776ddc6.pdf
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/176f42382.pdf
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/kabasagodipezow.pdf
    • https://static.s123-cdn-static.com/uploads/4486033/normal_6005313f01653.pdf
    • https://jodutofafedabaf.weebly.com/uploads/1/3/1/4/131452959/a1a861451f1998b.pdf
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fcbb8e1664a1.pdf
    • https://cdn-cms.f-static.net/uploads/4495058/normal_6026885fe6ae2.pdf
    • http://sokixatov.mywebcommunity.org/noriwigubibazaj.pdf
    • http://majovevalaji.sportsontheweb.net/vifako.pdf
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/jotopukosasusetazew.pdf
    • https://rilumegunelado.weebly.com/uploads/1/3/4/6/134615428/gurubopewunen.pdf
    • http://bovewitavivebu.getenjoyment.net/16102619793.pdf
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/sanuwow.pdf
    • https://xiluruzubu.weebly.com/uploads/1/3/0/8/130813732/8967202.pdf
    • https://static.s123-cdn-static.com/uploads/4391909/normal_6003443907407.pdf
    • http://deladinabixek.sportsontheweb.net/pesujasasazimibi.pdf
    • https://cdn-cms.f-static.net/uploads/4409405/normal_603588204eebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_8061ad0cfd684b26aca5b7a109eceaa1.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_675ab7f0308945daaf427154b1519078.pdf?index=true
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_097188babc454c7cb7f4a30c6114a0eb.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_dcae03e78a184788bdeefe7921058172.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_off0000dae9.bin
56aa1eb225e22da4814212456f3774374b62c1a25d3af755238ed128ae40473b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5268 bytes
font_01_sfnt_off0000ecce.bin
3039d8bc3fcc3218a368286253ed9571f59cd312216905208e80db6831c55cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10360 bytes

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