Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53e19e99fc48604…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 07:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cacb3c4a85cccdce92f7a11b8238fc68 SHA-1: 7f19fa1e4ab645f9f898acfed5f3fdbc63a53571 SHA-256: d53e19e99fc48604b0b9203919b4e3ec5d75163c4dc98601ba8677069034f0f3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://jualumnitoronto.com/editor/uploadfiles/30782129785.pdf In PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/13054052673.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210908_EEC041C1E1F78F29.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/41292393578.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16584195323.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zivinekuxuva.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/92111099988.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310de9de90e---xajagufeliwibep.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_32CDFA60C51DBFF7.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210907220727.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nefipitifoxetogujoxi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/fejesuwutitosaworogujol.pdfIn PDF document text
    • http://btfa.tw/upload/files/98075336086.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/mapuwexumeromuf.pdfIn PDF document text
    • http://vit-physio.de/file/40640399470.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/voramopeg.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/tifuloraxijubavenoxi.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wewozimituxikomo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/52759124817.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/84402230605.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/71886643632.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mazomewolelaxani.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/4377650995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+her+alibi+online+freePDF 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_off0000d7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B3 17928 bytes
SHA-256: 3a25b771558b252bc3872c5f03fe5fbfe1aac86f5a058ab28a282d74c4330709
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 10396 bytes
SHA-256: c6779919e0c0d34862be6711750433856a220c4307be5cb86257b298feaa009e
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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