Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04bbfe8f053f31e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 15:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 313c16bbf88eec0dc8702eacf7165c8d SHA-1: 3c2858d1d0123a52b9a76d5cca397d6722390a81 SHA-256: b04bbfe8f053f31e1825c5a2b4d7d66ca63475fb057e17eafb285e8322af56ce
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript and extensive link farm suggest an attempt to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=how+to+remove+lock+screen+wallpaper+on+android PDF link annotation
    • http://kurumakaitori-one.com/js/upload/files/zanedopotozogokulinom.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/nawumegoture.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/difejejatadifajegugovi.pdfIn PDF document text
    • https://mikludava.lt/images/files/47389906567.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kiwaxowaloxidonol.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/17707850498.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/97947184060.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/zumup.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/winefuliwidapekolatutogo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/92082268448.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/55105138418.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c96e2df65---20827392799.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/47213166615.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/23d216c3ffa11eda563e9518f8c9a872/96483027470.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/626849469.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/19896796053.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/kodewasozomuxabepo.pdfIn PDF document text
    • https://go2germany.ru/files/file/xefewema.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/42495562293.pdfIn PDF document text
    • https://linker.tw/files/perunakemigudidevofogo.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/lirunawarogusunok.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/48565029341.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43123603446.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/86070466333.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612EAF222F87A.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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10908 bytes
SHA-256: 5d7f4647b8ae54b99f7dc9c9aca591507c2f59261d6cea480f79ec351ef3d457
font_02_sfnt_off00011523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11523 16524 bytes
SHA-256: f616c0f740d16c939f61db4ddcc4c81e6e817e29fc3e2bbd99b29525d1c662b1