Malicious PDF — malware analysis report

Static analysis result for SHA-256 483e6c1cf60dc7b3…

MALICIOUS

PDF

101.9 KB Created: 2021-09-09 10:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 209c0ed5eecb02e44c0da85413e8e6a7 SHA-1: 6b08b9a2caabf8d5267ae047ef4c45d1d172e8ef SHA-256: 483e6c1cf60dc7b3bf892c543c7a556888fca419592f4d09e5c5c94160db2cc0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=main+muscle+groups+of+the+body PDF link annotation
    • http://chpcentre.com/files/file/doragumekudi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/13071797015.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/busukexejulidoxujote.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397fee9f107---23280454398.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/guzugawuvufemexope.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1d1ad19---gerusuja.pdfIn PDF document text
    • https://frisch.ro/files/file/34391234108.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/muwafagexuzuragu.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/rupodigav.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/mosemajunabatekoxitufaj.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/pederewosojirufewapozew.pdfIn PDF document text
    • http://allasclub.com/campannas/file/rebedavuzotamolizezofopa.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/22049138679.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/28149383834.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/8235970951.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/29735731085.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/raselareru.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/93873454626.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/80070468536.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/lobazukatipumevajedap.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/xobizibonitove.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_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 19636 bytes
SHA-256: 10db092ed24fe28c892edb732f027d17c5a0feaaedc91348ec88242de293a28b
font_02_sfnt_off00016f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2E 11416 bytes
SHA-256: 316771cdcd02feaeff882392561c9f3d200963989b456b4d94d33fb8b8b560d2

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