Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d2b0bdab28151…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 11:18:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f44fdcf942fe69d5bcd2879c51882c6d SHA-1: 02a0c69c717d3ca7385253c5dd32451516bb7962 SHA-256: b79d2b0bdab28151538b85b68cfc3d50a6a6300ae7f002cd274d19ed782534f9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://gimoguvi.ru/wix?keyword=algebra+nation+workbook+answers+section+6 PDF link annotation
    • http://freud.icu/cities_skylines_new_york_map_downloadd4jy8.pdfIn PDF document text
    • http://agencymedia-ig.com/how_to_use_waterpik_ultra_flosser8r4v9.pdfIn PDF document text
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/lubag_wepuz_ponuwoxopere_zagefanemo.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/linked_template_arm.pdfIn PDF document text
    • http://sunny-web.ru/how_to_insert_bobbin_case_in_mini_sewing_machinexocaq.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/4485496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/kcet_2018_maths_answer_key_code_a.pdfIn PDF document text
    • http://laxizal.epizy.com/45304651646.pdfIn PDF document text
    • http://kokalukavevip.epizy.com/diablo_3_season_19_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/b_h_f_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/mobile_movies_sites_hd.pdfIn PDF document text
    • http://legaporoki.rf.gd/additional_mathematics_360_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/problemas_resueltos_de_resolucion_de_triangulos_rectangulos.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/brave_movie_in_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/89487539892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74124b0-0836-4aa0-a6c9-89ad32ae8496/56156599524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01716db2-6abd-436d-88f5-52084006d7dd/apush_amsco.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/what_is_a_bells_palsy.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/android_box_remote_control.pdfIn PDF document text
    • http://rexuxos.rf.gd/eyelash_extensions_certification_training.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/logo_design_company_online.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_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 5408 bytes
SHA-256: 04d647cc90fb4725d3af8fa2cfe183d5b8411d19a8484756761bd70eb19ea470
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 12300 bytes
SHA-256: 8b0e629c11d51d733f9c8d790fd82de810bde1562952bc412bec58aae857c6ed

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