Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eb659ee376a044…

MALICIOUS

PDF

74.8 KB Created: 2021-09-22 20:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a0ef45f165f7df140c3bf0c8a45bab9 SHA-1: 540e2a3abd3cc673d74ac0dee4363efa8e588f95 SHA-256: 86eb659ee376a0447dd13376aa8a61a6022f531b06857a50c40f5a8646625119
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The numerous external URIs suggest a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.parkwaytransplant.com/media_upload/upload/files/bumadaxotone.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f32dd54d6500d46cfa957e0e12369d27/86803605534.pdfIn PDF document text
    • https://kaparatt.com/images/File/nujabiderezufekataletiso.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jemizoro.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2cb692bc3fab46240ab1c8d20391ef9a/33289975932.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/najexinovapawemedoloki.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/30370716604.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/90932909075.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/83440378972.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/82266617595.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/16795964346.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/3271677364.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/18326100705.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/vason.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/4116852384.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///25403014372.pdfIn PDF document text
    • http://www.og2c.com/images/file/kudinazikobakiw.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kuwelakakojudovusolaz.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/14876790941.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/gimumenemuwaxu.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/78024145038.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/77996841402.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/15157191407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=words+to+describe+someone+with+letter+aPDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 10856 bytes
SHA-256: af1a6fc1bc0e96e04644ac97705b9209e36529b55c79c06c8aa14556439740ba
font_01_sfnt_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 16876 bytes
SHA-256: 01ef285a16660234bf9d1e762c352cfd821dfee6c0abaa62b119d3a35a115abc
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1