Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a3fff5571a78c4…

MALICIOUS

PDF

83.7 KB Created: 2021-10-05 01:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5af424fa65225ff4956a5eb825f24fa SHA-1: 43769eb86e0c955cfd6a6eabfb519810986439e8 SHA-256: 46a3fff5571a78c42e1f454ab7b4eed0d4da044c01f0b14e7214d8b5396dccb0
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to phishing sites or initiate fraudulent activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=what+is+the+definition+of+non+renewable PDF link annotation
    • http://tribo.kz/userfiles/File/38932901955.pdfIn PDF document text
    • http://rotang.net/userfiles/file/natezapuwebixewapo.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/64004710917.pdfIn PDF document text
    • https://pokereshop.cz/data/file/powula.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/rimebed.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/86832014364.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/1695040479.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///41594222268.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/limejo.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/10298011684.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/16214582901.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uen3q4ltt5armtqrajmkccch7g/wopiloxajis.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/soraxune.pdfIn PDF document text
    • https://brakos.it/file/74496567327.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/23185283582.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/bibumowuzurejubezazu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/lojarigavogewekivepixi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/61255369352.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/5613394784.pdfIn PDF document text
    • https://bachson.net/upload/file/54010935078.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/bojarunipiposutabur.pdfIn PDF document text
    • http://tral-kerch.ru/userfiles/file/gaxafupexibedavebusaxomow.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/60937853246.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/19219460422.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_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 18476 bytes
SHA-256: 2b9e9eb5cda8518bc9307e4ab1feb8a4cc3514a17f349e681cca3315c185b889
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10668 bytes
SHA-256: 49e4661978a9025705e7d42f6d8fbdf40a7207cbfc9f43d5b57c86dbae97edda
font_02_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1