Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09c7c4b9c1fabea…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 18:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23ab13fdff1d984130ed1e1335fc34f9 SHA-1: 223e9309459952ea74e95281005b6c957235ddfe SHA-256: f09c7c4b9c1fabeab02f89f1c352d2d7f145e8dfbb708652d0e4bf05942528d8
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 point to disposable hosting, 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 embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://halkapsikoloji.net/userfiles/file/zazobujago.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/68901539629.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/84879201059.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/91305788382.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/kelepaj.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210916/file/16317271851486.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/31282718796.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/86901736053.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/rawiwaladosotapif.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58b07dfcf---7584134655.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109190814094706.pdfIn PDF document text
    • https://mahae.hu/files/files/29835344213.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/11276761928.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/95227597545.pdfIn PDF document text
    • https://yuktogel.com/contents/files/7142482334.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/46306929222.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/pinozuragakir.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/9372304177.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/56837763441.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/25438946841.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/4586162923.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/poxegokeke.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/28431197430.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f399e8e653---wiwetoseduwolifujodor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+android+for+downloadPDF 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_off0000c494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10308 bytes
SHA-256: 1e979a9ca12ea39a87c4eff4681e8962764a7ac9fd5f3c4a3bbd09e28326a5da
font_02_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17016 bytes
SHA-256: 2f7e9245b26f6a53ed881f4529f004c96415ae74ae9026f2a38d80fb73ce996c