Malicious PDF — malware analysis report

Static analysis result for SHA-256 55058e1367d99ee0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 21:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4e0acd4eababad6937b677f858547f4 SHA-1: 8a8216be8a34c47277d47d70b353e0fa9c42c8a3 SHA-256: 55058e1367d99ee0fe68eac7c80205d1b0887645769ae5d8d7ac916211694cb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a redirection attempt. ClamAV detection and ML classification confirm its malicious nature. The presence of embedded URLs suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=light+as+a+feather+stiff+as+a+board+ritual PDF link annotation
    • http://olympicburger1988.com/uploads/files/zuzevewazewolekif.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/doterirom.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/lemubarazila.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/naliran.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/kupokogonorijegoxugog.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109010515211003.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/46344756093.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/78650955227.pdfIn PDF document text
    • http://belean.pl/userfiles/file/rigefenibi.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jepulotojudemav.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/nivusemo.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/59991921794.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab257e721b---vufub.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021911128197946.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/22308951093.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/xegejewimarevada.pdfIn PDF document text
    • https://isosklo.cz/uploads/34178431734.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/60120637180.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/punobedasegu.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/34466114498.pdfIn PDF document text
    • http://webursitet.org/Files/file/dinabugulubowatanaf.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/77330251249.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/nujorozajebiraxotat.pdfIn PDF document text
    • http://e-hematologica.com/users/file/40949571836.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73100094517.pdfIn PDF document text
    • https://tarsiman.ee/files/file/95542109619.pdfIn PDF document text
    • http://tyextractor.com/d/files/barabekolipagenobe.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfd26fed1---davuvijufigusoxowego.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_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10724 bytes
SHA-256: 77a895915053aba118ef2973bdeec6ca530cd6ab2df31acd76135ab4ee4a6ee6
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 18200 bytes
SHA-256: 5abbc23b052cc47e199c0f8d1fd6ea027859c9946a9d8a8d7a0ac27f02cb0472