Malicious PDF — malware analysis report

Static analysis result for SHA-256 df51fbf7572ebe89…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 12:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ec84a5b98ef4dc10682b57bbaf6a9ce SHA-1: 11f79c9e1b11e21f9f8a3a0b7d4c51382583934c SHA-256: df51fbf7572ebe893ab7ca4547f8b1c3b23b0f5ddc1b1f3b032f47ef735005cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=index+of+macgyver+season+1 PDF link annotation
    • http://hwayoung.kr/upfile/files/21709396377.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/54468863852.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/48150113520.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/70610463962.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fovezofufeza.pdfIn PDF document text
    • http://canvangdientu.com/images/file/makorotusejixadajo.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/pajol.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9lrop6aah35hrs3lfactiie2l8/kajupifiwe.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/jaferabolazof.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/83998912636.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/libuwuso.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/wapujibijozibolobuf.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gakig.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/luwosokewaleg.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/41165306958.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/lonepeja.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/worifawuzujopimekodinur.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/mikosumuninusajineb.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/wuzumakakevubib.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/83385714573.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/93082447496.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/sevenorepanupalamuxu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb74c8c62---81691050007.pdfIn 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://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_off0000aef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF6 16608 bytes
SHA-256: aef552d1281163935db71fe000838e48f6e5c73b8c61f4ce6e4f8c2679fcaa33
font_01_sfnt_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10868 bytes
SHA-256: bc7df8a73f5ac121d14a9419df31d61299190de974940135905de706ca2c94ba
font_02_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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