Malicious PDF — malware analysis report

Static analysis result for SHA-256 c796531b179bb8fc…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f719385118aeb68794818f0705e74285 SHA-1: 79f066a6b48cc39250147150deb021ea432425bc SHA-256: c796531b179bb8fcb47a4a7ff0e99be3bf556120245c1b59aa0c1b774948f55e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=gta+vc+1.09 PDF link annotation
    • http://ttfi.org/app/webroot/userfiles/file/46344464858.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/63182494632.pdfIn PDF document text
    • http://offerparts.com/upload/files/majoseromofaxowivifa.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/rezoxajixuzesabidurab.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/lakesotavosexukijetixufu.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/32567557221.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/14185338513.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/zevabuzerokoregewolojul.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/lanusakimazododoroxegupo.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/41844435162.pdfIn PDF document text
    • http://deauville.ru/files/file/nisemewamoribepurovixuf.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/sizeletafedim.pdfIn PDF document text
    • http://konberdbio.com/upload/files/60108783219.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/93084106356.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jirajewonikunukividijad.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/47779820296.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136264300929---dolajejaki.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/57358910860.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/54912060606.pdfIn PDF document text
    • http://yjccnc.com/upload/files/93917906353.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gusudogoletovake.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/66931602218.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/97680879976.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/zifevujawajafogopuf.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/1547695808.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/27778822817.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_off0000b70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 17872 bytes
SHA-256: 7d401678b13d489376a000df764e5299c6a12d0853bd2e5f119da516cdf23823
font_02_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 9972 bytes
SHA-256: 2901282bca8fb4ff2b4cf4ad486444d149421d941aa5cbed77940e2bf3a4ca8d