Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f1327d0eb34342…

MALICIOUS

PDF

71.6 KB Created: 2021-02-27 06:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 68706a59f8012f7e268f169d512c451b SHA-1: 1f2a7c2763d536c8deb6c08363d176d75dc5d04b SHA-256: 09f1327d0eb343421a924622172590930502ee2e9478a9ae826bf2ad5be39054
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to malicious content.

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://zajinet.ru/strik?utm_term=nyne+bass+pro+charger PDF link annotation
    • http://barberking.best/slaves_to_darkness_bookutyct.pdfIn PDF document text
    • https://tuxaxigete.weebly.com/uploads/1/3/5/3/135324810/951177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_600182db3e87e.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/ee2ce40eafeda.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/4029924.pdfIn PDF document text
    • https://zuramuvo.weebly.com/uploads/1/3/4/4/134480672/xikazexezijatu_jizanu.pdfIn PDF document text
    • http://itmax.info/amelia_bedelia_storytyptx.pdfIn PDF document text
    • http://golosa-spasibo.ru/bepazilukabusibevitiwezeafde6.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/WiczTjd/airplane_movie_quotes_roger_roger.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fc6db47de295.pdfIn PDF document text
    • http://vuwobide.22web.org/app_store_for_laptop_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugowatutaz.epizy.com/relazulesef.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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 5372 bytes
SHA-256: 90681749b80df6a58313d4738e54681437292f763b30c392fdc79a8682c8194a
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 11012 bytes
SHA-256: 1078d210e288b015726234de27b42ed9718fbd053efbe20e5477492831af9ee4

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