Malicious PDF — malware analysis report

Static analysis result for SHA-256 73628c2d7df11988…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 06:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 804a615b684114f39e91e4179cc29ff6 SHA-1: 860305622c51f94442e73a61cd0ce7cf87a14cf9 SHA-256: 73628c2d7df11988535b16cccdd33ad078b4d035a1e2dc2937aaf3c9101fec9b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of many external links suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://smidgel.ru/uplcv?utm_term=extreme+car+driving+simulator+hack+version+apk+download PDF link annotation
    • https://lifo-sea.com/ckfinder/userfiles/files/nonuxixu.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/14079915004.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/zutegob.pdfIn PDF document text
    • https://webhosting4.net/media/file/22745719002.pdfIn PDF document text
    • https://hoavily.com/uploads/files/97283734853.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/losekejasopenekoguko.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bujobimekikesevurowiroki.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/88223325965.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/suxixud.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/17231270127.pdfIn PDF document text
    • http://citra.cl/userfiles/file/vuzuzojekagexudubaseten.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/60476154007.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/69237792411.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/73972b6f1222c383340c888e4963b43c/46481431542.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/pavobudimoxo.pdfIn PDF document text
    • http://marketingnews.fr/images/file/22462766615.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/deparamigimogaxunetib.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/zonevubefupatowupuruguw.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rifajebofejovavujevaxep.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_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16960 bytes
SHA-256: 45f083478681d904636afb90f78126a9b3f454e9f992afbd2dc6a1a29bf3e5b0
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 11388 bytes
SHA-256: b12c6300d77845d58f0972320754e6bdc12c2a5d1e25b51b10045de623983396

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