Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ebfc250cadb76e…

MALICIOUS

PDF

89.0 KB Created: 2021-05-28 22:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 857929b6949cd741c6ecc153417d10e9 SHA-1: 8e61a3fbc785264ea83d217a7c10a9e446d9c288 SHA-256: d4ebfc250cadb76e005df62e6f7d363610068aab9d22581a4a9c2d7909c3f4fe
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for unrelated content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://vilenefex.ru/123?utm_term=sahara+reporters+nigeria+news+hausa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fe6a0515438a.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/582b06.pdfIn PDF document text
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/91ce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_6039bb02a3d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_60661e3c25d4b.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/fevaruzaxibaru_vatojunaravex_jatuzujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_605f36803ed15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa872250-2311-4851-b4f3-c738f79eb3e4/how_to_open_a_bunker_hill_floor_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431fb707-050c-4bed-978c-8d0357e846cb/how_many_watts_does_a_mitsubishi_mini_split_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6515916-ef71-43f8-a9bd-c0cce7477230/83807742201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ae2853-4205-4a3e-97b7-097acce19c2b/cuanto_tiempo_tarda_el_papel_aluminio_en_degradarse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02515e34-92ad-41af-af3a-16c676d1aee9/wordpress_tutorial_complete_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f9a484-73ba-46a3-baa7-fddab4b99f75/kujiretifizinufikoxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f435ad03-b867-4d6b-b411-636fdbcd19b4/pataruselititewubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f09d634-aa40-4f97-bfe3-4cae5f6154c0/descargar_gratis_diccionario_de_la_real_academia_espaola_para_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ddf7a4-42ed-4c45-816d-8d80217096f1/oasis_drinking_water_cooler_parts.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
    • 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_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 5244 bytes
SHA-256: 39295a99f14f77e9888754a5d7245f76d2caf203f4fbdaaf374f3ed95a6de71d
font_01_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 14128 bytes
SHA-256: 7be7c12effe495df905f37cedf68d056ba02598d1cdd3f9c13d0e25a07c67be9
font_02_sfnt_off0001414d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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