Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4344a4b50f3dd8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 15:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2c5550f6a5b12848a1c6f803c136708 SHA-1: eb6afefac2fe83f900b0c4b67674af4f2cdec6ab SHA-256: 6c4344a4b50f3dd8f146e101542757239d98454eac46dc520aa5ed0ec7a67779
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=audio+music+downloader+for+pc PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cd25e26204470faa180647b8e39920d9/basotoximawafemosoni.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/mitaxivamanezejusuko.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/xularawixovad.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/jebulevamiruku.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/tefogokifubi.pdfIn PDF document text
    • http://sswjeans.com/files/65324171466.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nukakikilumurewevizos.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/12499650757.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/36296136488.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wijefem.pdfIn PDF document text
    • https://pixel.bg/img/file/gasinapal.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/nawugimigevaxomibifeg.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/14432442788.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae5b90747---24043336802.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/57585418883.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/47546199052.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/1631345148.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/bozinowaxobovubijunuf.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109081854048110.pdfIn PDF document text
    • http://bienbao.net/uploads/files/17769358853.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/77474232166.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/jukulugobarem.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/ninijumiginon.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/32854008686.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_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 17004 bytes
SHA-256: 4a70c63039aa6e8a439cd53c479a9fac74c31f522519255d52a3d0a890c90005
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 10852 bytes
SHA-256: 5b33c9edc705e06f5014eddc184774c6dac4e02128fffc37b5be39035535b726

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