Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cd866a05e3e59b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-22 18:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: edd9a91e68c3a4c415b1e4efd338be3a SHA-1: 853fedf2fd13d0e0085fab0e8f7e7c7269a3cf84 SHA-256: b3cd866a05e3e59bb0f957580ecfe04e00b410642e5b30a96fc42fe74eaf4c6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://akgoz.zemta.com/uploads/files/panigeralena.pdf In PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613ce590c1446.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/17537096394.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/36419158849.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109160622076092.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/28464204810.pdfIn PDF document text
    • http://tabletopad.com/images/file/kisikezarifivibugafas.pdfIn PDF document text
    • https://hgb.se/filer/file/biribowusunokewagimoteni.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/97106081787.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/josizutukodobozokip.pdfIn PDF document text
    • http://juncheng.tw/upload/files/28019765725.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vekukebiwad.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/gananugixa.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/xedaxutulawisefem.pdfIn PDF document text
    • https://kratky.eu/files/file/nirob.pdfIn PDF document text
    • http://webs123.com/userfiles/file/silidoserujelu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe6246d3d---komijol.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/lazotikitisusogasuveferew.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/zapirisi.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/kobixodevemogin.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/wudagakovelixubow.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/waxezosoxot.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/88026226469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=virtual+android+root+apkPDF 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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 15696 bytes
SHA-256: d93507d554c95a572e4bd7287a5d5f38ce2b8aa4ea856eacfe67bc9e87addb83
font_01_sfnt_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 10248 bytes
SHA-256: 9f6a750fc03f85cec3b971fefe98009c38eb456960beadefa6ed0bbc87510c91
font_02_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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