Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4529cadff5e50a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 06:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 005f171544acf420fe88b10f1ae7cb02 SHA-1: 9d07b2c0d55985fb8b9ae8af9523086e3aa1af96 SHA-256: 3b4529cadff5e50a27a7935af39a62dcd8a780f779bce1ddfd75b53fac325327
134 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 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 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://nomylo.ru/uplcv?utm_term=learn+2+fly+unblocked+no+flash PDF link annotation
    • https://all-stage-meditation.tw/uploads/files/613fe5c89cc67.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/zuniporisibaganawijavil.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nopulojawazotawime.pdfIn PDF document text
    • https://tcremich.lu/files/files/xiribup.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/63791694678.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jarojepufinipelezabek.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mepodinibapop.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/leniribusadidakutibeke.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/taluga.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/21815262705.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/75182114932.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/62465912461.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/19/37604593543.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/laropugebidixuxoxu.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/72484065940.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/putizomapabekeji.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/29963743723.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/25503036311.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be47e1eb1d---jepowidudokigi.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/70878742246.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dadoserivudu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wibifuloxusotoliwu.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tirodakibazovopij.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/noxibitifisazugegibe.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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16248 bytes
SHA-256: 45c1f7db191c1f547fd75d85251a803e4b383808614d94eb9c8f603fdc86b9a6
font_01_sfnt_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 10904 bytes
SHA-256: 2ba9887701864b974d9450d0b1a9fc8e326a8033c51c7de25ca511224e7a15a4

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