Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e9bd9028dd0db9…

MALICIOUS

PDF

102.2 KB Created: 2021-03-19 03:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263f87084fe10e9cc7cda4135731e71e SHA-1: 8eb7f3d8222abb8ee5828e4e81dddeea356b0ec5 SHA-256: 61e9bd9028dd0db918ae879515fbe2584907207ccd4d203b3e6b3ca48a2a1bfa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs points to a domain associated with link farming and SEO manipulation. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest a potential for malicious redirection or further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=alimentos+transgenicos+en+el+peru+pdf
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/4f96c31242.pdf
    • https://cdn-cms.f-static.net/uploads/4470019/normal_6009efe691625.pdf
    • https://cdn.sqhk.co/minofavazu/TushaAT/pelebowezonesakinudo.pdf
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fd67e9b156f1.pdf
    • https://cdn-cms.f-static.net/uploads/4458124/normal_6052a25899f8a.pdf
    • https://cdn.sqhk.co/nenutipu/Q9eqjdm/xiziluvemofon.pdf
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/5c53ed.pdf
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/d863ede.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/gurubidov_lamivepopuz_wison.pdf
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/8948751.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_604f7944348ca.pdf
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/jafawadikuxo.pdf
    • https://cdn.sqhk.co/nuduniguwufo/LpihHIk/gefuxojut.pdf
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/muwodejal-vijifomulo-dojanax.pdf
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/7367614.pdf
    • https://febefuso.weebly.com/uploads/1/3/4/3/134382796/8d1e86db2e83.pdf
    • https://sivitudogadix.weebly.com/uploads/1/3/4/1/134108631/53d492.pdf
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/aff697482.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/3671183.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/laradusa/niledadegup.pdf
    • https://s3.amazonaws.com/jizubisetebof/deep_impact_movie_in_dual_audio.pdf
    • https://s3.amazonaws.com/libusamagowuvo/nukadusifasejenedipukofib.pdf
    • https://s3.amazonaws.com/divikufifir/many_much_worksheet.pdf
    • https://s3.amazonaws.com/sazomo/virimetarojito.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_off00014f67.bin
598c92417860e88614488b30207b13d913b3978a4e71de5f09a31c62e37456d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 5464 bytes
font_01_sfnt_off000161e3.bin
94671279e8b9a63908b14c86339e9f961b67c6a579de0bfe57336dd01b7482ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161E3 12340 bytes

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