Malicious PDF — malware analysis report

Static analysis result for SHA-256 40edcf75039b81e8…

MALICIOUS

PDF

74.5 KB Created: 2021-04-25 07:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 78a43b4435114d141b1be6f02371e4c6 SHA-1: b1a43279d74e3f944adf141f9611d23d83446af7 SHA-256: 40edcf75039b81e8f6e23518a32c26ca023a3112b21df4d3c4f906ca7e937987
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=what+religion+is+young+life PDF link annotation
    • https://cdn.sqhk.co/fujalapevame/W9ieCij/bomekatufogimedupasoku.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/varoxijewegot.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/j7jd8gc/oneplus_3t_jio_video_call.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/a62MOr3/vazajujofejisowi.pdfIn PDF document text
    • https://cdn.sqhk.co/bikawegaj/bDagiaC/free_download_broken_heart_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/CijuNVx/76931880389.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/hbvXjjc/pokemon_tcg_online_trade.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/x5hcY9p/wutumixowiwoditubexozig.pdfIn PDF document text
    • https://cdn.sqhk.co/fezemepusap/fgfYBjM/vurifonalegajogizajudamo.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/bhhgehb/optical_inquisitor_17_full_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/Dif4ics/slide_hoops_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/6ChaUhc/vavev.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/9SqieZM/descargar_g_cloud_backup_apk_uptodown.pdfIn PDF document text
    • https://dukuvewag.weebly.com/uploads/1/3/4/0/134041028/da7cc0500815.pdfIn PDF document text
    • https://fumozowafujazuv.weebly.com/uploads/1/3/5/3/135331302/5339068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_c0de4b3ad66845f1b683472ce8c8800f.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_5f1b68db63e64cd7b97e5800547775e0.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_32b8e88ad94c4c9ab6175e8198b1453b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/autocad_for_windows_7_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/email_format_english_writing.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_1141f7cc44ed49ac9340572fceb79a38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/bejabunafasumilidafemibi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5144 bytes
SHA-256: 13fd9843425a650f08ec3ae972bda9b351a84f1e0dc29670c73af125377aa7d4
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 10884 bytes
SHA-256: 22f6d9718144bab99480158cac5e562ec64277e2566f6b8a4d46e477fa7141f1

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