Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48366d1673acedd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 16:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ce81e49ea3c5248a4c34e601a898c0f SHA-1: ecb82c737dd98a869e7da0ea6cbc28685b38ddb8 SHA-256: b48366d1673acedde2e3c452f4eb8d9fb477d470e22983b0bf41ce0660713a24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=square+root+of+30+simplified PDF link annotation
    • http://tbeaindia.com/userfiles/file/nazabelidafuxuv.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/fepivatajiwegesafonirubu.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/miveb.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/54432910171.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/zazag.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28781392506.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/87086874835.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/71660785984.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/xupudeg.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/25027722066.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912211531.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/78913615439.pdfIn PDF document text
    • https://tadimtursu.com/image/files/guwazutajufivutaro.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/tazewogidi.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/zagoxejabuvan.pdfIn PDF document text
    • https://aildf.in/userfiles/file/zunovamimuzekemagox.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/40115381399.pdfIn PDF document text
    • http://sinners-party.de/media/file/39501643005.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/30335815585.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/43864600133.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/pusegixedelubisabufawi.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/fomofewukatanenom.pdfIn PDF document text
    • https://songhongresort.com/img/files/85875309088.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa7a3d20---notinijutuvawoxeke.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/jutopewunukogilovetapeb.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/89549399935.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/35290182820.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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 19484 bytes
SHA-256: e33feee68ea8e5cee9cfbc1e7e8e538c588cdf97daacf1db7e5c519fe2ba1eff
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 11168 bytes
SHA-256: 77d3fde42edae35306ba6144b224d69f67352244ee2dd4cc8f22ba566efab617