Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b9701f7cd59308…

MALICIOUS

PDF

69.9 KB Created: 2021-04-01 10:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15384fc8ce790a87c79179c3bb1f45e8 SHA-1: 866091e383955f2d18025c16f6cb8d7daf18e6b3 SHA-256: d2b9701f7cd5930874b736dccbc68307ef0c61b0ddf0ff8e750540b44eee4c8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://dafemum.ru/award?keyword=english+grammar+test+for+grade+4+pdf PDF link annotation
    • http://givimemaregudum.sportsontheweb.net/cal_poly_pomona_campus_map.pdfIn PDF document text
    • http://wavewozokuxa.getenjoyment.net/93310688582.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/fpsc_sst_biology_past_papers_download.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/50185684099.pdfIn PDF document text
    • http://tb-films.ru/schneider_ats_controller_manuals8biy.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/cavite_mutiny_tagalog.pdfIn PDF document text
    • http://d-youtube.com/how_to_make_bulletproof_coffee_dave_aspreyas2wc.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/skf_bearing_price_list_2020.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/icom_756_pro_specifications.pdfIn PDF document text
    • http://getveran.site/kalesijuremepemamemixufes6uvm1.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/whirlpool_dishwasher_gold_series_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepagewav.atwebpages.com/90727705847.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/29020176874.pdfIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/linear_regression_vs_logistic_regression.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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 5500 bytes
SHA-256: b0ee2320988cdefcb90fbb0624d82e952f51a9fe86ae1f5962d2cc446e3c846d
font_01_sfnt_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 10248 bytes
SHA-256: 12e2a6449b3850e8a19884b93475ab8413535c35e3ad740b334260993406e748
font_02_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501