Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ced216d9d58b5dc…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53d8a31e44426268a0d94d2c17c1034c SHA-1: 6ca3934a8d10da5e35084edb2a6171bdc5fd0780 SHA-256: 7ced216d9d58b5dccd3b6dac5e915b98122888602cfc4d36cc93fd0f5341a579
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=retro+camera+pro+apk PDF link annotation
    • https://magnanelli.com/userfiles/file/vesidudunefowo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/24920249496.pdfIn PDF document text
    • https://mbbs.hr/files/37029889957.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/siviwimetolibejizotugexoj.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_192053.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/60548135872.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/lejokidenomuzitelidoz.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/timotitakaxegexovefuwanon.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/wuboravederuvenux.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/terujenobajet.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/papasoluvotalimoguduv.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/67730432123.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vgo4cr54are7cqajdh1g3m7erl/12538431668.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909015339626352.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/89962682961.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/36129717873.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/838d9b5ee44408cb726d3a90f66ce68a/38803748048.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/2756858653.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/nifanilavipigapomuk.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-20/images/files/pazopamamupakarubedoder.pdfIn PDF document text
    • https://badrivishal.com/media/muxofaru.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/46730641698.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_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 10264 bytes
SHA-256: 98084f561b01ff72ab83ed76a892a6136aeb0c6c91d85873fba571e28b9910ce
font_01_sfnt_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 16628 bytes
SHA-256: c336e1c2fb28c8b54e0d43ec09a6fbbc964426e57c1ef47b27f1514c676993c5
font_02_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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