Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51565293f63ffda…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 14:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b41fceaad0b4c73f42123de6adfac42b SHA-1: 5fc57fca5601add2613ebbe5b270175dacec45b9 SHA-256: e51565293f63ffda09f4ac9d941a36dabde86a7de724768d3c6a08a0e5258726
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • 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 http://vitalenzyme.com/uploads/fckupload/file/71761169791.pdf In PDF document text
    • http://dreamwith.gni.kr/ckupload/files/zetuwutijosago.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/90908940156.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/gesununapav.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/13864993732.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/rulovupagemuxufa.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/kufotoda.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/65916856599.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/nutirodomodivezoderor.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6f93b45c1---jakije.pdfIn PDF document text
    • http://only-svet.ru/upload/files/14045975226.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/58169673278.pdfIn PDF document text
    • http://greenglobepms.com/uploads/93970139018.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/dudatusatuwoz.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/mubajiruret.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/nufedafup.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/36436096395.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/1352311143.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/97119706469.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210913222007.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25996680562.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907023158.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141902e0e369---49599888350.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191954542.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///59583229327.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/gesinibimelojewoxatigiz.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/jamipowiturusumeriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sqrt+of+56PDF 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_off0000b67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67F 10028 bytes
SHA-256: 78becb962b403d59edfc74b0f936ef14a7832ec71ac58adcd6f6f137f1ded884
font_01_sfnt_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16348 bytes
SHA-256: 51917990fceb9c5c1c5d38b53d36f7014ce3adda59bca9d3970cbdbeab0abfcf
font_02_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1