Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6a76092d6d7a44…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 23:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15a5e074ccc7be996c2e103e4d7c1c8e SHA-1: 73b497a805f6da41fd2514624a87dfa1e1fc1922 SHA-256: fc6a76092d6d7a44abcce4d9b7bbd74d10664190e0c13d789a9a54a1ec7108eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism to a phishing or malware distribution site. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing attack, likely using embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://georeno.ca/userfiles/files/6690705982.pdf In PDF document text
    • http://zafirkort.com/uploads/files/13870952624.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/pezadiloronaxotilugotido.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/kikiboxewipikuzow.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sajowinapexikuderamu.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/sapalegogikofisuzetuximo.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/22775225831.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/41100727921.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/77574626425.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vulefekib.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mawotadiliwazetafu.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/jedakonixakobigovokazo.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/mozokodeludobaki.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/880b07635f57119084bd99029d736639/32030166332.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/xawonefoginajaz.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/89178276386.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/2556793017.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/74177838721.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210904181424842509.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mijisedavored.pdfIn PDF document text
    • http://foxhill101.com/userimages/fozibarajelobukezijofef.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/marurekedo.pdfIn PDF document text
    • https://mar3ol.com/Files/files/35689844248.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/20626070188.pdfIn PDF document text
    • https://partnermind.cz/images/files/23719888877.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5783a2abf8dfa68240d03fb5c837c1e5/veforikaxagavuzovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+es+file+explorer+on+android+tvPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 17848 bytes
SHA-256: 518bd74a78307f5251ae7d019895714f4ca3baa2a5c5498f79c6504dc545c121
font_02_sfnt_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 10736 bytes
SHA-256: 17515cee05fb625dd1576d432f2df3b52327a2b789ff1e973f35c64047d5d93e