Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d394be0bd3f4b9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 19:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75d195c2daed080eeab53e1cbdf43bfe SHA-1: da0d5486ffe77cbd29f70dafd1e2a0e506bc1ba5 SHA-256: 18d394be0bd3f4b9f651040b154db11159d6160899794622a3821d2943eb89de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute phishing content or malware. The embedded URLs point to suspicious domains, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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 https://coretry.ru/uplcv?utm_term=psychology+glossary+pdf PDF link annotation
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/7954710934.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/kegazis.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/63512199581.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe2ad5cec---pumerakag.pdfIn PDF document text
    • https://matrixx.lu/images/fupegoguwederipereserilup.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/texosafomotexejugiv.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/37319019874.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/pikomezimazotomenel.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/67375178269.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/17670491272.pdfIn PDF document text
    • http://apex-architect.ru/images/file/wirexusuzizukogubi.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/nidogolunakevisuxufofugi.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///3552962790.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/63317700779.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/65519082623.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/60013119210.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/wutitasaxifopabulitoruwef.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/13529242272.pdfIn PDF document text
    • https://phr4u.com/files/kixejetobiziserijosax.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/40182728235.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/39532834831.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/nivusofevaguvenibo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/nogatijusevirisapapenowi.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/97440068580.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/32246511114.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210907115222.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://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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 18056 bytes
SHA-256: aea172f11de36723ebc24977eefd2e5b17ea86723cf58785f48ee3b3442044ad
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 10588 bytes
SHA-256: d3eac0a44438de6d2cbeb84daa2a7c65e0fe46a159e323995a3167f8e22a8969