Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d5d8a9d04e2d99…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 15:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 896d3b7b388a20a36675366ed27c1fa7 SHA-1: 9b11dffc27cfc6f5554d49a98d4e3118a73d4ba9 SHA-256: 52d5d8a9d04e2d995247f5f4278605a37a2a8e92ead9e0fae773079c88000e25
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to disposable domains and are presented as movie download links, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest it is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ottuk-e.org/userData/board/file/98100120357.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/5223557942.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/pakemefevilosijaf.pdf
    • http://homelife-superstars.com/image/files/dinajobakonekigefe.pdf
    • http://mskgroup-spb.ru/upload/file/39134867637.pdf
    • http://consol.hu/images/uploadedimages/file/debovamasabaxevo.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/76476258137.pdf
    • https://fizjolech.pl/userfiles/file/11575425644.pdf
    • http://nuovojob.com/userfiles/files/3378735896.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/30f542f45725fb81cc7981e314e8c1ec/64658874901.pdf
    • http://netart.hu/userfiles/file/51675374389.pdf
    • http://hysansam.com/fckeditor/userfiles/image/xeloxejemezorigupajumogu.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161310f14182d3---lamakipipakuzerolon.pdf
    • https://calienglish.com/ckfinder/images_store/files/57801592642.pdf
    • http://yjsyrj.com/userfiles/file/garux.pdf
    • https://srmhomes.com/images/bulk_images/files/71669643114.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/69440569292.pdf
    • http://thessalonikiflights.com/files/files/22608886087.pdf
    • https://olgunbey.com/upload/ckfinder/files/tifuxegesazovoroluna.pdf
    • http://hrt-foto.hu/_user/file/bovepuruvatosotikuramapib.pdf
    • http://studioguidobarbieri.it/userfiles/files/72025352183.pdf
    • http://sieuthibds.net/images/files/40003520465.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88462564231.pdf
    • http://abwingsjanaf.com/uploads/files/kowef.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/pisuxasobumabola.pdf
    • http://kvarkeno56.ru/userfiles/file/36538170013.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tamil+go+movies+online
    • 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_off0000db1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16792 bytes
font_01_sfnt_off0000f334.bin
2cf072ad8dc06193fc6e2b9ded1630394362743b0b7aae6906eeff944c3e357a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10280 bytes
font_02_sfnt_off00010a53.bin
c5e05326e73a806e562e0766be5141a5fc30baa58fbfa634cd4cb5b76b31709a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 17224 bytes

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