Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16752bd6d1306d4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 05:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c42e8cfc6f5c78c81f2879b3e0e16e55 SHA-1: b92894ddff471ab8e7c862747349bfe2c3a350cc SHA-256: b16752bd6d1306d4d76be3b208b1acdeadfb08dc32e27e0246cb600d2075bbce
186 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 0.9998

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://mezovuduw.ru/123?utm_term=song+punjabi+sidhu+moose+wala PDF link annotation
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/7192663.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/bec7ad8deaeebd1.pdfIn PDF document text
    • https://ralawuxageg.weebly.com/uploads/1/3/4/3/134319431/sinabutaki_vofiraxoninan_dabos.pdfIn PDF document text
    • https://fuwiwidiwijidex.weebly.com/uploads/1/3/1/6/131637339/gofigovagapudirika.pdfIn PDF document text
    • http://draiwenstore.online/which_braun_silk_epil_is_the_best4uu1h.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/jafawadikuxo.pdfIn PDF document text
    • http://4kuhd.me/85542296907ydj32.pdfIn PDF document text
    • http://nukels.xyz/labunefirepulajinmvdfd.pdfIn PDF document text
    • http://avtoshkola-region26.ru/richard_wright_blueprintuil5o.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/netukuweto-fasopomisunupog-nexoxagupidokal-lawej.pdfIn PDF document text
    • http://899themes-demo.ru/descargar_geometry_dash_world_pc_mediaf_reosc6x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaborox.rf.gd/vancomycin_davis_drug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666726dd-4fef-4410-a379-caee9a3dfefa/the_shock_doctrine_short_film.pdfIn PDF document text
    • http://bojifif.rf.gd/14461964007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42004db-66c6-43d9-b0ea-572371450897/washington_dc_weather_underground_10_day.pdfIn PDF document text
    • http://wajovidufara.epizy.com/10403467115.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/soil_erosion_causes_and_prevention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b1a789-a649-4b3f-a98f-7dac10b2521c/best_crossfit_wods_with_running.pdfIn PDF document text
    • http://gigapexolazet.rf.gd/dream_interpretation_dog_bite_my_leg.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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5688 bytes
SHA-256: 688436132feeb6c342c75b55137224d4986120976a7453267adab4f8ee8e200f
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 10348 bytes
SHA-256: 677cfa2ca5b8f1dab1168197c055dc6aaa06f80f0af3418cc46744c6572baac2

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