Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d223b2b67385cd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 02:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ddffa08949a8c6f6c0e89e9af2ff8b8 SHA-1: fefb688c268c9cc48c973d4e15950da3b1e4fe94 SHA-256: c8d223b2b67385cd567de38ec599486589e45da9c9c565900e2d272f93f9ddf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the PDF structure suggests it's acting as a link farm. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the presence of external URIs indicates an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=masterclass+proficiency+answer+key PDF link annotation
    • http://105chers.netsociality.com/upload/files/17891973008.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gabololodutijagabokepiko.pdfIn PDF document text
    • http://hijoin.hu/editor_up/rekalixiseridozepaj.pdfIn PDF document text
    • http://edallyshop.com/upload/files/10366100329.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/puxojoxopinevajuxa.pdfIn PDF document text
    • http://usmleworkout.com/files/file/56299537282.pdfIn PDF document text
    • http://darstin.com/userfiles/files/64796106757.pdfIn PDF document text
    • https://socardan.com/userfiles/files/bovagi.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/rawadeda.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/74871663260.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/24320890238.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/31204740918.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139477501ffb---15298207350.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/wosapipijamusawijuvujun.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/27604046854.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/volevufuzipiwumubal.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/xawalikir.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/nemaralata.pdfIn PDF document text
    • https://membermimpi.com/contents/files/97189039459.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/79753160722.pdfIn PDF document text
    • http://teresachild.com/upload/files/40997590959.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/zikunoramiliz.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lugawotirara.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/mazogexijuxivilo.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/13472952495.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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 17596 bytes
SHA-256: 47b6ca10d0607f9ac3e09283d23d77df7ce123754b8eda9369457c38c42d8f7b
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10760 bytes
SHA-256: 63b570b0013858bc638c3cb04b58a55ffcc058145d61e902b62fd8c456493218

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