Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0db7db4bd49ee8b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 02:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f95321f7643c1edae2f7abafdcd560d2 SHA-1: ab6d04f1a14af780fe79b04a187a7c326e908292 SHA-256: a0db7db4bd49ee8b93a1d699ac3aa7d5ee6a102991cee0ca70e1773901937c64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://nomylo.ru/uplcv?utm_term=download+pokemon+light+platinum PDF link annotation
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bisosis.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fovimul.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a29990c3c---50753043439.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/30327476533.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/3629104278.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/31282300999.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090112040270.pdfIn PDF document text
    • http://runo34.ru/attachments/file/midenabipuxa.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/75326058068.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/98461800823.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/sugesinigibatofaxituti.pdfIn PDF document text
    • http://whatdwellswithin.com/file/71461158626.pdfIn PDF document text
    • https://chp-travel.ir/data/file/30530360272.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/3751677040.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sajoruxitorepamese.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210916120246.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/nefetizojosuma.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/97560336291.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/49131186366.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/44304753564.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495022de20a---bunepitakewow.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dazikefowovaboto.pdfIn PDF document text
    • http://dasbluemchen.com/7234838163.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xamofizero.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/dexobag.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_off0000b55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55D 10852 bytes
SHA-256: 1200840c341ce27e64c94b780285f5bb88c70e1d8bba09abfd16ada53594c144
font_01_sfnt_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 17624 bytes
SHA-256: 8dcabdfac1ebf0aca0a12fbeebfbcddb1ab54d19eab1fe063d22951fa2d7396b
font_02_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1