Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cae8544590a201d…

MALICIOUS

PDF

76.0 KB Created: 2021-04-17 14:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec5372f8e5d120af0d56bb046cb19c3e SHA-1: cfc46155fb4c3d042220ebb6c6b76a40dc020ee2 SHA-256: 2cae8544590a201d50ca9fd0e69826d19b707c1023316c3cc677e2b18f29e5d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to redirect users to potentially harmful sites, with multiple distinct hosts and disposable hosting identified. The embedded URLs, such as 'https://midufefew.ru/strik?utm_term=is+magic+chef+a+good+brand+of+microwave', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=is+magic+chef+a+good+brand+of+microwave PDF link annotation
    • http://bubble1.space/43938799643o4fhh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fd89bab12c4e.pdfIn PDF document text
    • http://onlineeshop24.xyz/lisudaz0qgi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcba54e2c420.pdfIn PDF document text
    • http://studyweb.site/everglades_holiday_park_fishing_reporttbm12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6017a9457cae2.pdfIn PDF document text
    • http://feedbacrnz.space/natugoduvoxuzuwafikikenen1hpf1.pdfIn PDF document text
    • https://zinixukugezevul.weebly.com/uploads/1/3/4/6/134612333/sawitepipuwe.pdfIn PDF document text
    • http://devgame.design/how_to_use_xfinity_dvr_remotelgs9n.pdfIn PDF document text
    • http://generalmassage.online/biblia_reina_valera_lenguaje_actualxwn8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_6037d4e7b6134.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://tcerkovniekupola.space/cool_origami_dragon_instructions7yigy.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/e74bd1657773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fef162fa6a53.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/169721d.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/livirilafafa.pdfIn PDF document text
    • http://tesar-krd.ru/oshenwatch_luxe_appeim7r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xefejevife/velid.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/fhwa_report_bridge_deck_drainage_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/kufulomerepukuwot.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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 5632 bytes
SHA-256: ab6011f7b5c9d0e4ea9e31ccc79bcaa7ea293a57d3b97900192e580331fda968
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10488 bytes
SHA-256: 61edfbf1ca1a5c9d03fc442d1858a7fce7dd67e2a92170f99055dbe01da2c79b

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