Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3bdf09a84ee7ba…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 01:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7dfcae4628f6a9db6162b320c74cafe SHA-1: 94513067482b92fa293d7197d5f85d6c9ce754d6 SHA-256: 1e3bdf09a84ee7ba63ee7f18b65aeb3a50a168ea5d0826491d18204eb6468ac9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://h-n-s.net/userfiles/file/16362034904.pdf In PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/mekekakodijax.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99164926461.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/6989681856.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/43239683156.pdfIn PDF document text
    • http://bulmarconsult.com/files/2576581301.pdfIn PDF document text
    • https://istanajp.com/contents/files/36031560575.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b29bfe252db30deddf3760d6f0171f0c/xubevujibosanewijup.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bosuvabewuxunexufobukovut.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/68938364795.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/43732554817.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zapujano.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/40531135262.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/72192312487.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/37842606815.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/rusejolumidafovidawud.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/5336921130.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/38687671669.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/tegevejelokimoganav.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851871d73d---pipifilijas.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/83844398573.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/13906787272.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/58132682627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+actualizo+la+version+de+mi+androidPDF 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_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 10788 bytes
SHA-256: 256b9707d4324e7e59f7fe51a96fa654d4777f589d174d40f2907453ea93574c
font_01_sfnt_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 18288 bytes
SHA-256: f91441a5ea84c030af546dad8a407bb2cb899259f1d9871bcb310e19b1f47b45
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1