Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1c5699bfff25b9…

MALICIOUS

PDF

69.6 KB Created: 2021-06-10 04:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 45578b1a0fc4b7a51fee91de0570c5b3 SHA-1: 223ec52011cd03ebc8e31b0e8a4f25426f53e25d SHA-256: 4a1c5699bfff25b93cfe969fe81033bc201118efb6b407a3d177fd7f73bc66b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://wastran.ru/pbw?utm_term=grade+3+word+problems+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fe78e43e5510.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/navopisu-nezapuponubelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_6042ff49b00f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_604821aecc92e.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/5159830.pdfIn PDF document text
    • https://sugemisikuwev.weebly.com/uploads/1/3/1/8/131856456/tewekibox-juruwuteza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropotupi.pbworks.com/f/24557736996.pdfIn PDF document text
    • http://fajopab.pbworks.com/w/file/fetch/144941007/animal_planet_top_10.pdfIn PDF document text
    • http://zedilowozare.pbworks.com/f/gta_sa_lite_apk_11_mb.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144472305/sagela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f73b583-4fda-4677-9616-e143baea9332/information_technology_director_resume_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2634546-1e98-4e41-9c4d-cc56d33db492/how_to_attach_shark_steam_mop_pads.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/senikozepevefifalajimoral.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144463443/17199514333.pdfIn PDF document text
    • http://podimil.pbworks.com/w/file/fetch/144985218/20507679090.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144418950/ar_verbs_in_spanish_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff495274-7f6f-4cd5-8981-4bd5c93c5d63/peavey_vypyr_15_amp_settings.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/28667186608.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144808254/29798216247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d0fd06-b365-4bfc-9b58-abd3ca41ec04/wuwivewoguko.pdfIn PDF document text
    • http://feteselulo.pbworks.com/w/file/fetch/144632868/13895745802.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144657393/how_to_root_kali_linux_2020.2.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_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 5692 bytes
SHA-256: 72e06cdd1328e7fba2077c25d0abdd4ad16b1bea60d148e89fb1398529b9ed2c
font_01_sfnt_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 9840 bytes
SHA-256: 2812d9139804c9ba3662fa0151dfaea026845defc93739970910f56ff9ffe922

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