Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2476b2c005d2624…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f858c25f785ebfaf6ac1bac039cc5b6 SHA-1: 55bdb72e423e7ac725bab608ac5e55dd07b51cd2 SHA-256: a2476b2c005d2624edc26e84f759ff2f5dd68b47621feb8b564c423d49bea31f
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to a second-stage payload from one of the numerous external URLs found within the document, which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://newgoodluckcrane.com/admin/uploadfiles/file/1600834544.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bajanumazeje.pdfIn PDF document text
    • http://humanlitech.com/files/files/tosem.pdfIn PDF document text
    • http://gibisch.biz/files/files/xivuwibuzokizodozaku.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/fokulegobozat.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/64099525158.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/dikaguxi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398589b5fcc---90836409498.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pisuvogofigekebeku.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/23741145148.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/lepugikiki.pdfIn PDF document text
    • http://praguetransfer.com/files/file/58808262929.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16141da2c59d4d---54260818123.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/78093768664.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210910205816287366.pdfIn PDF document text
    • http://muszempilla.com/files/file/totajuti.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/megekaj.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/18638750783.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/60954988514.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/kuposijazatinodosunudugod.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/xulumemigawox.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kufekazavenipuvuzadademez.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/nuzamu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fizofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ripple+boxing+streamPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/teribejebefifemubud.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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 10880 bytes
SHA-256: 7e6af2f89197984a3667da03d8f2b1b4b74096b24ff57ff4b0db98205321c87a
font_02_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 20112 bytes
SHA-256: 16edf84c16a79f1af0068b1779cd9daddcd202b0936a84f3fa2fe46461da3570