Malicious PDF — malware analysis report

Static analysis result for SHA-256 f890ce19bfdf83e2…

MALICIOUS

PDF

80.3 KB Created: 2021-03-21 06:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c9fb8e2667078ab976ac03a03763d69 SHA-1: 26aa3cfcc0cc0770b677ea134bcefbfa4fb5df4b SHA-256: f890ce19bfdf83e2e4072c905f02cdb2c8bd7ccb23e00ae8ed63aafbcd05b9ec
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The embedded URLs, such as 'https://seumenha.ru/award?keyword=acetazolamida+mecanismo+de+accion+pdf', suggest a lure to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=acetazolamida+mecanismo+de+accion+pdf
    • https://sagelaxun.weebly.com/uploads/1/3/4/5/134594749/xogenuso.pdf
    • https://moxuludo.weebly.com/uploads/1/3/4/7/134759924/0e01a224.pdf
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/0f85547807d4.pdf
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5fdf142f7c447.pdf
    • https://semuvobe.weebly.com/uploads/1/3/0/9/130969465/6924839.pdf
    • https://cdn-cms.f-static.net/uploads/4404285/normal_60373ec8d4424.pdf
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/wezedis-veximukadipet-kiziduvebofoj-wixilejeta.pdf
    • https://xibutunu.weebly.com/uploads/1/3/4/0/134017024/7457946.pdf
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/5839494.pdf
    • https://cdn-cms.f-static.net/uploads/4379846/normal_6053b1ca5faaa.pdf
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fec56a32c08e.pdf
    • https://pofifeluvoka.weebly.com/uploads/1/3/0/7/130739131/6f503068a3d.pdf
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/lufexofo_wefunekonodikir.pdf
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/5762088.pdf
    • https://cdn-cms.f-static.net/uploads/4447265/normal_5fe8c3fa2ba2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xisefowu/86679069738.pdf
    • https://uploads.strikinglycdn.com/files/f4af6a26-7c14-4623-a84b-f46931dce2d0/how_asia_works_book_review.pdf
    • https://s3.amazonaws.com/legapatatezisa/38750210778.pdf
    • https://s3.amazonaws.com/xurixado/bureau_of_indian_standards_act.pdf
    • https://uploads.strikinglycdn.com/files/3b757bf6-3bcd-492b-ab2f-c35fb1636e5b/feworavibuf.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_off0000f5df.bin
9407806d47a9af055513e06a2bbf946331e1ff00d7d83473612c58cdb85646d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 5244 bytes
font_01_sfnt_off000107b6.bin
d01c602a3c6fa4ea8cb44af91aeb1f73c6d6f5aa316f335cb25984a1c422760a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 12928 bytes

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