Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eca743749155f9…

MALICIOUS

PDF

118.8 KB Created: 2021-03-01 14:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eed9fd72082e3a9f151cf3de1ea72f8b SHA-1: 5e1bad50f6aaa317bd8756527732bbd605b81320 SHA-256: 40eca743749155f932b278ca9f934fde33aa32c2c4bd67ec3a810f36d530c173
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=plato%2527s+allegory+of+the+cave+full+text PDF link annotation
    • https://cdn.sqhk.co/penomufepuk/jNhdia3/matt_s_daily_deals_amazon.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/30891205771.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/gclihkg/49780770558.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/saheeh_international_quran_arabic_text_and_english_translation.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/motorola_hx550_manual_espaol.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/elementary_differential_equations_boyce_11th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/uLjjmGR/36181349649.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ghbibs4/super_jake_s_adventure_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/iieprig/real_steel_2011_full_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/drjeDgj/crazy_taxi_2_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/feeigtv/star_falling_from_the_sky_drama.pdfIn PDF document text
    • http://jurelireroxux.22web.org/judewezomalexivifu.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/X2hh94T/wuxoposu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojoxubifazavij.rf.gd/coliform_bacteria_food_poisoning.pdfIn PDF document text
    • http://zonefodewev.rf.gd/manuale_d_uso_lavasciuga_hotpoint_ariston.pdfIn PDF document text
    • http://legopabez.rf.gd/47848057775.pdfIn PDF document text
    • http://xigoraviwa.epizy.com/bussid_kerala_oneness.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/85968888163.pdfIn PDF document text
    • http://xinozotaga.rf.gd/how_much_does_it_cost_to_fix_a_rolex_band.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_off0001975d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1975D 5408 bytes
SHA-256: 84696e83502813d4757697918c30943a6c8512b67e12230585c95d1286642aff
font_01_sfnt_off0001a9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9DB 10412 bytes
SHA-256: 2d36e7705211e530610d77642d54e3897537f725a0c5ebd03dd5a3b6971875ad

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