Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0f8799cf3043ec…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49186c979974a5bd9fa9b953a06f2af7 SHA-1: 36d195c007ae7b996af605f790d8427966242d73 SHA-256: af0f8799cf3043ec55713ce2c405a45d8b7aec3b0f02f5f81b2383069c3adf43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=how+do+i+set+my+phone PDF link annotation
    • https://go2germany.ru/files/file/97213455273.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/86943027987.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/78690556968.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/bodimavepefojev.pdfIn PDF document text
    • https://clubon.top/uploads/files/xaxizizuromor.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/xemotawapuwizu.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/35888532201.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/ditanixogavidum.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614144e04f43c---nuwivunori.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/58568561981.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/bunivuxazuka.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/2000380201.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/72767741400.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/gelunukagunibumasiwojufi.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/20067658058.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/bagopejusaxurevigo.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vebiludajijituzoxinuwor.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/82561569407.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/nejiroxotirubufevi.pdfIn PDF document text
    • https://12tiga.com/contents/files/fumagatolu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614503998591a---nopez.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_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 17224 bytes
SHA-256: 8f592d479573af5a24d12bc0a994a171a3e1d3415812cb562717ae5791e6857f
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 10540 bytes
SHA-256: c90b532373dc68dc4bfbf26b7dac9c77bc7e062dfd004ea44e27a1c8155f0684
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.