Malicious PDF — malware analysis report

Static analysis result for SHA-256 258dcc71f6fb249d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee850330193f2950d6e01086939a894a SHA-1: cd51df5102e06c9a9eedc9c4e4a406a3c093c33b SHA-256: 258dcc71f6fb249d6d3b9196d27429b087f6a19fa16902abd08929e6077bfb71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to lure users into clicking on malicious URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://clubberia.com/js/ckfinder/userfiles/files/63123022498.pdf In PDF document text
    • http://eventologia.com/userfiles/files/ragopuvivoberug.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/rumavakemumidepadomiremo.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/24193303788.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/kowux.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/40785148754.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/48672551532.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210916050627_px2nog.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/31883092988.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139675633819---sizuwifiwofozewa.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/81404602739.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/52212287222.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/89527970514.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/29407230160.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/dabikilenuleridobezomatom.pdfIn PDF document text
    • http://etkenkalip.com/files/logotoxogidufozevaze.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/xojuwulox.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/50062060041.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/negiwid.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/30508034491.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139d90c24741---11225856905.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/64743055519.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/kegoterupebelax.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zuniroj.pdfIn PDF document text
    • http://aprt1day.ru/file/vajulitomamor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+10+5g+price+pakistanPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/badijamasenaxakaza.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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 11256 bytes
SHA-256: 08c24f451557e16345905a3ea1ed2f516cbb3352cce4aa0cadc1c749da1040f2
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 18976 bytes
SHA-256: a50311f8a1ecbb5341cfb4a28bff479971fd949e10f8f9db18859bf4b990ad17
font_02_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1