Malicious PDF — malware analysis report

Static analysis result for SHA-256 851d4adcbc158cc3…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 01:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ddf3d70e30276ea0b4c70f2e3f847b9 SHA-1: ea3444b0a687ef3104b33ed9a844cf034755c6fa SHA-256: 851d4adcbc158cc37799cb35f5906587a1cff1c7fed0c610292aea529c71d92f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://karapinarinsaat.net/userfiles/upload/file/39079168140.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/wagepugisebu.pdf
    • http://emrc.ie/upload/imagecontent/file/71660414486.pdf
    • http://ggbris.com/slbdavbatala/userfiles/file/kanekimomujinejusi.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zorofi.pdf
    • https://nieruchomosciprzetargi.pl/files/file/84868333072.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a9fe2bd8---kisusabu.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/3094161339.pdf
    • http://baozhaopharma.com/upload/files/9608535558.pdf
    • https://cottingham-group.com/cufiles/files/71257079967.pdf
    • http://vansuloi.com/uploads/userfiles/file/zupigazupizeneset.pdf
    • https://presstone.hu/userfiles/file/66397387218.pdf
    • http://surausa.com/uploads/files/71232061928.pdf
    • http://bytip.net/filespath/files/20210911174515.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bamekoterasixoxonufuguv.pdf
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/kipowerobukawokanaro.pdf
    • https://showdetango.com/bafa/userfiles/file/61020906634.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/vawuruwibadowokene.pdf
    • https://dodomacnosti.net/data/file/dilezejeditawut.pdf
    • https://soudurelausiere.com/upload/editor/file/1653135412.pdf
    • http://gold-carsales.com/js/upload/files/37364180297.pdf
    • http://normel.org/files/upload/file/54647411344.pdf
    • http://www.samuitns.com/image/upload/File/tudedipomenuzijonoxi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa96834e8---vutubetur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=reset+password+android+studio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 16792 bytes
font_01_sfnt_off0000c753.bin
34a9006be378d3421ebc9cdea6e720ee3a1ba32937178e5f30d1278286b183a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 15108 bytes
font_02_sfnt_off0000edc4.bin
3fccaf3707ee65f0827454c34bb885287430a9a3ae58cb1b98da3d3a47c355ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 10568 bytes

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