Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e1888f35695682…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 536f3d5f53c946088548a608db42398f SHA-1: 554476aa8415054e086aee928ee08aef88fa5c8d SHA-256: 41e1888f356956826b7622e2bb6efa833915998c1304e3eab5bdaef6a5051ae8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=prince+of+persia+1+pc+game+download PDF link annotation
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/dilix.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fakomuzutagebidewuwotewu.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/51519952968.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/koluvise.pdfIn PDF document text
    • https://0900107678.com/upload/file/fopemu.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/lawekulijenapavel.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/naniluzinibutamibulala.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/xalegatomaboz.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/66210160685.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/vakiwakaloterusojapit.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/65031144315.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/42163656461.pdfIn PDF document text
    • http://greenld.com/userfiles/90561624355.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3b53b6e---84300205824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d031981c6---62112399321.pdfIn PDF document text
    • https://hojoairport.com/images/file/20406861734.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/69072608882.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13602180724.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/xugixerubowukon.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xegurikitasoperulu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/69795662524.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/zimebibosafa.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/64885614493.pdfIn PDF document text
    • http://beta-rc.com/upload/files/meminaxabateje.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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 16432 bytes
SHA-256: 636973ad76f434466ef38c95a35ec7c1b742b52198e62801182785b339d59be5
font_01_sfnt_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 11004 bytes
SHA-256: fedfc9bf8702353e2078702a1af512a52ca75658e4e16cc71493521dca475fd7