Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d6beb050d84f2c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 17:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e19f40824d1f49d56510b2468a194a4d SHA-1: c2e93ee413dabc376815875e2d2721f9abf9cd84 SHA-256: 90d6beb050d84f2ceb458ee3bb78e682ea762ac1c1df0fe12b78d1d683a33e16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one that appears to be a redirector for a game download lure. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=gta+v+download+full+version+android PDF link annotation
    • http://dancephoto.ru/userfiles/files/90865308850.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/rutozofezefuvawiki.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/nugenadurezurilezubi.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/8892100311.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/26df17b4e9a0272451db8b668a0e4187/46769884697.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/dijenusukujekesejimiwa.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/jemakutawodipajikojitaku.pdfIn PDF document text
    • http://mobil-tech.com/files/29455774104.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/derikewazibo.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/65658828234.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210914051829.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/13503317203.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614efe016626a---zigedilefererezi.pdfIn PDF document text
    • http://ppp220.com/Upload/file/topimepewe.pdfIn PDF document text
    • https://evenements.gipso.org/ckfinder/userfiles/files/tezugibokizudemoni.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/fobixopumipubipaperex.pdfIn PDF document text
    • https://domilot.com/uploader/files/ximikesiregajo.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/94935440465.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/37122734240.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/94837678830.pdfIn PDF document text
    • https://kawanmto.info/contents/files/31483025465.pdfIn PDF document text
    • http://furniture83.com/upload/files/52583767146.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/76662887478.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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4A 18684 bytes
SHA-256: 92d9862da8d23e318c39a84507be87d41a22d3bbf0dc48d2d846acd01dee4a73
font_02_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10636 bytes
SHA-256: 7324c3db17bc369eee48b45d0286455358bd24f2dd10c12be67bbb998f390d44