Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a5e1476ae1b261…

MALICIOUS

PDF

73.9 KB Created: 2021-03-14 16:34:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b17cf7e220d2e4d80b4b92f2cdc3311e SHA-1: 98b910b876f46d1e493a00714be972006c507f9f SHA-256: b0a5e1476ae1b2610c86c22a68e43832105211f4b023d98a436eb3544c9f009b
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-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.
  • 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://ponafet.ru/award?keyword=insert+blank+page+in+pdf+acrobat+8 PDF link annotation
    • https://cdn.sqhk.co/dekavaka/fqTifZq/unlimited_dynamons_world_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/afjbgd5/potag.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/hhHhfie/pro_football_pinball_machine.pdfIn PDF document text
    • http://techanomic.com/lakopesekusayhwlg.pdfIn PDF document text
    • https://cdn.sqhk.co/nufolibizer/u6tjhpI/kiroxexujuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/YbifKje/rapesawubidu.pdfIn PDF document text
    • http://healthytrands.com/fluent_python_book_redditqnra6.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/gdjcgeC/hidden_objects_mystery_society_crime_solving.pdfIn PDF document text
    • http://ital-girl.space/javorudijenezepilonizlojbj.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/fnEbf8L/bikeniludu.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/gdhfT21/gears_war_4_gameplay.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/big_data_book_2020.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/72949905463.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/ehihhgc/colouring_book_for_me_and_mandala.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/18039787403.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/ae7ff39b-5041-4c75-b0e2-d25bf5b19344/what_years_did_kawasaki_make_the_bayou_220.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_f4f525043018470db352d3353d0b8bf1.pdf?index=trueIn PDF document text
    • http://lurarapekakaka.atwebpages.com/lexique_comptabilit_gnrale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520db5f6-fd8a-42a0-ab05-766a4b22983b/ireland_postal_code_format_in_sap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a476248-b181-434c-9025-05e1acf3f6b5/logufosuxerezekupalof.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_6f18b015bbd040529d107c8a9190d4df.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_d4c12570d6414e29825987291ca68dbe.pdf?index=trueIn 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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 5660 bytes
SHA-256: f4a0478e402f39660802dff8e58eb30d35318f84a01b7cebd91b5085c44eee58
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 10764 bytes
SHA-256: 410ba391e946bc79106cacde343d1aa93fd59646e7f07c75856415c78f809feb