Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe699d6cdded78d…

MALICIOUS

PDF

79.1 KB Created: 2021-02-20 19:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1463c50832b8d54b47c529b9714474d1 SHA-1: e88b0121a0b08f5ac92a968f868cd3b63adf96cc SHA-256: 5fe699d6cdded78d6853d9ac3ece4a195c65a6dc84e2d44159c0094851624e4d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference product names, likely as a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=hp+deskjet+2620+all-in-one+wireless+inkjet+printer+tesco PDF link annotation
    • http://choosemadam.site/ejercicios_verbos_regulares_e_irregulares_espaolv2qid.pdfIn PDF document text
    • http://taher-tcac.com/playerunknown_battlegrounds_cd_key_activation02ps4.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/fotorafaderonop_pijofuw_devapijepujun.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/5e864f13939e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jgqjbjh/bunny_bookmark_origami.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/zawopawotoxufutozobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5fe7d9d0262fc.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/7d96c0.pdfIn PDF document text
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/gutirositenuwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5ffe5371e43c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/ihhekif/lowasiwivejuwugo.pdfIn PDF document text
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/tutinikunamix.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/nupezetoso.pdfIn PDF document text
    • http://revershjtb.site/lumazenexulolaze5uf.pdfIn PDF document text
    • https://mumujikik.weebly.com/uploads/1/3/4/8/134896301/zovudaxofan-fixipuremo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 5720 bytes
SHA-256: 7cb1f6449411115a14d1b5c5205798a871eeb13e88c5e54b08653cfadb10a087
font_01_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 11028 bytes
SHA-256: c840635d9b1ca3d801eb561cc663efddbe804983fb399dcc38f42072679aedfa

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