Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fba4fa89d68c62c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 07:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cedd87f04b6c43840e2dce9343f74c68 SHA-1: 689f5dc5ec9977febd0c4852755e8fc78caf4b83 SHA-256: 7fba4fa89d68c62ce5b9c219eef26762fb32bbc591d752f4abe6de322cdc7cfd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings, particularly the ML classifier and ClamAV detection, strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous external URIs found, which are often used in phishing campaigns or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jedetale.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/bifebizijinuz.pdfIn PDF document text
    • https://webmenuplus.com/images/file/5155447391.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/47494226407.pdfIn PDF document text
    • https://shibbirs.com/media/files/davezevofusirefajifuva.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/lanebososinunaguvuzipolaw.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/76484217826.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/vavitikoxovaretipifazosa.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/nedikobuzuwevowila.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/99fde44d9ab2549144ae4e31f94be184/vudulujegusoronak.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/13331405505.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dijelake.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/somozumosuzogunat.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/badusawabi.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/16468989589.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///11094878045.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/82169445754.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/19571093855.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/2966779213.pdfIn PDF document text
    • https://taperagi.com/contents/files/mitexegebufixiwiwu.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/37075555014.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/wemijimemimivagemun.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311482836819.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tiponurorelujebuta.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828ffbf3a6---mumigudexexisurapirosus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+dead+space+apk+downloadPDF 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_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 17280 bytes
SHA-256: aac3c2132fdcee7473d5c8984b72902d55949677675621628ba8c506c36bfa23
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10472 bytes
SHA-256: 88155fc6596489a4c0c98eed89a750abab5adbbf8da14837b6f2b004fb7149ae
font_02_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1