Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c0fe0d536e973c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 21:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a59a36e273ca433dbb53258d512cac27 SHA-1: dc396862c3aa68f612b8e7d80d7c21b1a902127c SHA-256: 96c0fe0d536e973c662dc807d3cf61a965f353ee83f2c7d6203c99035321bc5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on low-reputation hosting, suggesting a tactic to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=dream+league+soccer+2020+hack+ios PDF link annotation
    • http://l-max.ru/userfiles/file/sezamazepef.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/gilatufanif.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/perudalib.pdfIn PDF document text
    • https://turbooto.vn/upload/files/82870825120.pdfIn PDF document text
    • https://aneri12.eu/res/file/sumadogiguvimumasozo.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/90266744139.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/68072530541.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/momub.pdfIn PDF document text
    • https://ksuskalology.com/images/file/79803702953.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/58785346626.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/putogikakobobimoxuwaviw.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/lamejemukewutumid.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/likigosazivelokaruwuvuwev.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/wejaxuxabixapajuves.pdfIn PDF document text
    • https://ewt.cz/res/file/75590297519.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jiwikowuno.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/milarodubefafiwudunijiwoz.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/48409888553.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/rujukifuwudasawafiwegi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35ee53b38---vagugi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/rilisetovijiko.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/kasufavikojenimifomed.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/24133156949.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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 20236 bytes
SHA-256: cea533658dcbf8913b3d02d613506a0e8c83d167f723caf5bae62a5f542e9f9d
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 10912 bytes
SHA-256: fc493f009e822ea660323c943138b718c9c48fd8d8a7adfd29f7f0a72a44147c

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