Malicious PDF — malware analysis report

Static analysis result for SHA-256 e838ad20e5d0afa4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 06:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85fb5dfe222f2304a7c8e3e8f0042df8 SHA-1: f0fca7659058443e14bcfba22d50c024bcb2b287 SHA-256: e838ad20e5d0afa44b01d47f429a98716074af153d7246412de702dd08dc9a9c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains, suggesting an attempt to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a secondary payload via the embedded JavaScript. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://elencostruzioni.it/userfiles/files/bufabarositenapelapo.pdf In PDF document text
    • http://tns-china.cn/editor_upload_image/file/danorexitujevodagirovos.pdfIn PDF document text
    • https://renewone.de/files/libabigepozegivologadoxu.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/sidonamavisosilewepajav.pdfIn PDF document text
    • http://foxadv.net/file/47408356620.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wawejapuguser.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/94319665098.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/57314586686.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/luzufoditafe.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/4564131903.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/gumukufa.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/12945532316.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/jajoputixukudodufemoga.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/846i2mjahsjnrieklj6muj3m2b/72827009032.pdfIn PDF document text
    • https://bselink.com/userfiles/file/65855419831.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/17466024108.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210904_89C244DA295A48C3.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/4254768999.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/zubef.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ba682aa84f4314066ae9ff04cc750936/fawetogu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/21041751662.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/50232806400.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/kelerefijopopasiribufo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/5973026051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+mame+roms+for+androidPDF 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_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10504 bytes
SHA-256: de6da992130f9337585adc80e2b852409f260202763777acaf9b87f67e120159
font_02_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 18036 bytes
SHA-256: fb943df1e527c34f20a7d71a5c2fa5279b34296a12e2e36d8b8f979fdb7afd81