Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14f827a2b102ef9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 19:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c6992bff3af9d7bd71f7f9170eacf864 SHA-1: 41c9b6bbd94336e760506cb32a36d75342ee0aa9 SHA-256: e14f827a2b102ef975ff55556168f4913edcd0f8bf1576df096457e4cd25b851
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The malformed stream length heuristic suggests an attempt to hide exploit code. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://ranjitabiswas.com/userfiles/files/9196759539.pdf In PDF document text
    • http://homokkepek.hu/editor_up/pugabegorobirixuvijosebus.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b81bc961f5e8e0f3827908ff7cdbd2fd/44530924512.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/19474489263.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/gasidetorotojixofu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/vajoredudop.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/ziwemofinodike.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/73666286832f41fd727af4a79ab69b8a/14640521157.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/40812980544.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/pukabinaxegaxibigamu.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/20433338968.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/minilidekewapobumimamoxun.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/84976626553.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/51247553846.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/51777480245.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/tixiwinopuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ullu+latest+web+series+watch+online+freePDF link annotation
    • 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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10768 bytes
SHA-256: 90f8c652832ec3d1864517d279999f05cd8dbec61c69e3c5a1a43353c3fce9a6
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 18004 bytes
SHA-256: 5beab3b9b17459fac9b968f7455c085e63a9f21aa59c9e98758909269cabdf46

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