Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f8c500151bfa8e…

MALICIOUS

PDF

72.2 KB Created: 2021-02-19 14:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8f8fbe6e094e4571ed9987471fd1a709 SHA-1: a3eae9607f89b5b471e722ac42bf1c24d4e701f4 SHA-256: b5f8c500151bfa8ecf64f139e443cb6480fa6a14db2d6a15bc75e4785005f897
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

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://baarspo.ru/wix?keyword=digital+citizenship+worksheets+for+middle+school+pdf PDF link annotation
    • https://cdn.sqhk.co/jogekiluse/3mjjIsM/divaricate_typhonium_price_philippines.pdfIn PDF document text
    • http://triple-doska1.club/5113748130654xcv.pdfIn PDF document text
    • http://ru-en.xyz/krups_xp1500_how_to_make_espressojxylp.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/iqifJSa/75452418719.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/hcry9k6/lipasefewaberadexuxujuxa.pdfIn PDF document text
    • http://prolac.ru/fogeluyx667.pdfIn PDF document text
    • http://giocodigital.space/96297027214xkqaz.pdfIn PDF document text
    • http://sodaapp.pro/548963723980kh9c.pdfIn PDF document text
    • http://armada.technology/what_is_the_cost_of_cortisone_injection2v1ra.pdfIn PDF document text
    • http://smirno.life/renters_lease_agreement_formnm9yf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palakojum.rf.gd/db_legends_apk_mirror.pdfIn PDF document text
    • http://galefawanakujum.rf.gd/93830722053.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/eternal_palace_first_boss_guide.pdfIn PDF document text
    • http://niforubuduxema.epizy.com/eclipse_php_installation_guide.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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 5776 bytes
SHA-256: f6ddd524522f6044e23fdeb24b6f1f30b71facdc8d486a8f16dde5e0b92187a3
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10308 bytes
SHA-256: 98a806cad90625ab877a3647e187e3622b7cc265cddf61827d9033e240f7236c

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