Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cc25fa4ee3f22f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 06:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5391f85c6bd707e9f0c06aeff09d21ee SHA-1: 2c4d1e0bf922873d912ade727566ec9312e75d0f SHA-256: 82cc25fa4ee3f22fc2cfa9e2d8669162c22c870ac18c7ef7302639e358848fb4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=setting+for+droid+vpn PDF link annotation
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zagifiziresaladelo.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/57537841052.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/fewogunonurok.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/13467790487.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/67849627166.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/12025242011.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/vabolowuz.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/78150581903.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/67584381541.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/doborises.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b86442040---lerixeru.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/6408270641.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/54428999418.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jatakadokujufuv.pdfIn PDF document text
    • https://onecre.com/images/content/files/zuwokiwob.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab9533d7b---3545432309.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/19425603997.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/faboxemifimunutefo.pdfIn PDF document text
    • http://bienbao.org/uploads/files/janajedudo.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/mosujegobudetomakov.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/81810738179.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109120508487131.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/54277496575.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_off0000cfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 17032 bytes
SHA-256: 28db54de5059a9f0b6ba48a8cd5fbe8d7207be55108479b572ea1dba3c447c4a
font_01_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 10440 bytes
SHA-256: 7065c67ed0ac181e2887def5d533017e3a93cae79b05126c2c5cf88276c07530
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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