Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba8494d40112cb8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7366ede86c7a2fbed427b1ef7e9f8e77 SHA-1: bbf3e1968e263b6dc41489fcdd35b2bd43810089 SHA-256: dba8494d40112cb8b04edf93c064db5adef670b485e84ce5a95980d51851cf25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to disposable hosting, forming a link farm, which is a common lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ecohost.ru/pics/images/file/livadozukuxuxib.pdf In PDF document text
    • http://archi1919.com/smlclub-files/file/95252259576.pdfIn PDF document text
    • http://hueide.com/upload/files/roxigaduv.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146fb578f226---38861152292.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/3277782362.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kabob.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/48115423816.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210912180234.pdfIn PDF document text
    • https://esz.jp/img/editor/files/gokepobupanurok.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/labisovopan.pdfIn PDF document text
    • http://linker-apps.com/files/jilakexutigogowot.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/wenujixipiju.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210916055039.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/mupeturilumekan.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/xurorusub.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/jisabavodakaxafozajalu.pdfIn PDF document text
    • https://equimat-cheval.fr/file/pafigo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/mosowisozufesatoxiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+14+data+obbPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137358722567---38524304715.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 18304 bytes
SHA-256: 447367e1ed85a2c825d731961b34b9a369e39cfb93292513ff3f5e7ffa26c71f
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 10044 bytes
SHA-256: cd523dc357996fd7ef88bc079bc426253554e563aad45f568dc4f32bda827dd7

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