Malicious PDF — malware analysis report

Static analysis result for SHA-256 115795d0d00c42a5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 17:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd47bfa7e6a4b3b15c57be46ff5e3348 SHA-1: 3b7b14c30981d88b18523bb3961031deb288ddf7 SHA-256: 115795d0d00c42a55151f0b5ae8b9d7991fc0e89e05230a4c66e90f51581f93b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with minimal links per host, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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 http://faradtvandor.hu/picture/userfiles/file/jujifarebabilesulopumime.pdf In PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/75458510273.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zemibene.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/tajijozuwisi.pdfIn PDF document text
    • http://ingore.cn/upload/files/80249678247.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/42379025825.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/80846351565.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/vuwinodiw.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613827bc4809e---fixasewo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/11141439719.pdfIn PDF document text
    • http://greenglobepms.com/uploads/gaxadufugirupuwoxeked.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/22394732384.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/74409303781.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137446701c23---73896893457.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202198444156038.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/9468371282.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/vekamipelaka.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/tikopijujodi.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/fibodorekutasibu.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/98007217526.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/1893551558.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/bopilod.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/7862500603.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/44632432595.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/vawiroge.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/46955647540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tintin+in+tibet+text+pdfPDF 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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10100 bytes
SHA-256: 69010a52fd5e86092dcc7a946091f9ecc732a13acaaa1c4c0cfcf3d000d055dd
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 19272 bytes
SHA-256: f341db737c104cb90f3fc20a3bb4ae8526450584db3cbb8b09d0799cd3a553da