Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7534f3aaa5c874…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 01:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6a9b945ef82ddb682ee773e31fdd4ee4 SHA-1: 8e4a855d51cbecf8af8da44508e3f9d862b2813a SHA-256: 0a7534f3aaa5c87463b815487c90aa7ce525631b03196f3ce884b33489685193
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, such as the observed 'nomylo.ru' domain, which are often used for phishing or downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=latest+apps+for+android+2020 PDF link annotation
    • http://doctour.hu/uploads/ckfinder/userfiles/files/zumovebenufav.pdfIn PDF document text
    • https://koratspring.com/upload/file/fifotamidu.pdfIn PDF document text
    • http://belovosushi.ru/files/55764487981.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/varupirifaragiwuvasisafab.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/serigo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/35896778639.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/rovogozirobiz.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/89386179445.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/zuvib.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/texowatawajaxikipupu.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/retulowegedofinatupenuxal.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/2964563317.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/bavuzoviro.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/5968320469.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/17890541799.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a72a1ce2e2---50595184403.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/14747659653.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210903_031208.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/91994197318.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/40141809782.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jikoxupepatuvupidugub.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/wefumowupobunotapifelu.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/xaravomewagofu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/30740248066.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/rudaretagokozisiwatedikix.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/70956883212.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 15528 bytes
SHA-256: 9ee649a9133dbad7573d0a26e79af32a2be511d63aa9b8613af406c15fdd3528
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10644 bytes
SHA-256: df12d5ce8ac1fc61e139603eb2f45a6932da49ca8f90ddfe4b1946a7270a8c59