Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80ca5d83f024a5d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 06:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14369af01955681728a018325efabc9e SHA-1: 74c5a892e89dbfc78ab69ef997d57aff628b3296 SHA-256: f80ca5d83f024a5d0b1215754d4df16fb9071a4ebb64ee199243e7f77b2b6882
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 PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or spam campaign aiming to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ccsctda.com/ckfinder/userfiles/files/20210917_084956.pdf In PDF document text
    • https://cancelaria.pl/galeria/file/fifidumekegi.pdfIn PDF document text
    • http://newo.ru/files/files/59248561503.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/37115380994.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/natubulopalawusuxolalesal.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210909055911_cyx5dk.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/xajedadazov.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/12154812518.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/polujikubo.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/ledukositujenevil.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/figug.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/25632476466.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/rezozewevoko.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/63337200303.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/98697633843.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/pusadobegolovamugupij.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/kowubefeb.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/nawefanax.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/kukerazujoma.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74093765618.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/22688721874.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/fufibiditilot.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/weretofigapobikowujudat.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/23658650392.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/temosugexenebawe.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/piguradipudizuwujor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=shadowgun+deadzone+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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 10580 bytes
SHA-256: 7fffdf237b60a47d78773598547fa3ffe6296447a43b2c3f282bb6a49cd12e6d
font_02_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 14584 bytes
SHA-256: fdaa4c5027ce7a0e0facd9e27fb6f11dda28554f5634011bd9e591b0b12f25bb