Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b45499c9183154…

MALICIOUS

PDF

80.5 KB Created: 2021-05-20 13:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e389b54cc83232c74135f45b854839fc SHA-1: 547e3982d7f841d96468a1486c5627c129474126 SHA-256: 13b45499c9183154eb94cae932043513ebacfd1caa7bb7101255a2898207ed51
156 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 0.9991

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 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/strik?utm_term=real+followers+download+ios PDF link annotation
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/9134324.pdfIn PDF document text
    • https://rixesibajarij.weebly.com/uploads/1/3/4/7/134712387/kamajugamakasot.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/liluzan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jutenojamega/fodujuvunimalopapesuko.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/what_are_the_types_of_statistical_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/74252531604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3e2c75-2a96-4977-ae2d-1dd4e263029a/mercury_black_max_150_bogging_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad0dfe8-26ba-4be0-9ac0-9d93c12e48e5/hobart_handler_190_with_spool_gun_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/rational_inequality_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/41925743117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6837f694-25fb-40b0-ae0e-35a6fac6dc6b/les_angles_cm2_exercices__imprimer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7faf14a-d57f-470d-a58c-f4a145595d09/22381202989.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/zojofunulanewak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bfebd2-99cd-4340-8b32-f0c4a5f333ce/26957668124.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/pised.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/exercicios_botanica_enem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472f234c-385d-415b-a089-8a151d5417b3/89948816746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a33a22c-8657-4fbf-bd77-dfda789ad285/autocad_lt_2019_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcc1f65-395c-4d5d-8c8f-e66ea35d8bd9/troy_bilt_190cc_lawn_mower_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/wacom_cintiq_tablet_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/cedrus_house_cqc_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b80a875-7ae6-4e33-8fa7-18866d4680ec/gibatuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703ddac4-6f86-4a33-9a5a-1d193c03e582/74056950090.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 4708 bytes
SHA-256: f9221f9458263aa5bd979c809ddff93ff7236f461109f1b593171e4eb88cc4a1
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10720 bytes
SHA-256: 31aa00704796d06661efa5c8cba6b4dc4ca98e0ea40f7b6b6229b92203546e07
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361