Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6b992ddee9ad92…

MALICIOUS

PDF

73.8 KB Created: 2021-10-05 19:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec3eedc3ea949877bb9139d1c8271c3a SHA-1: 516c5cf29d98b65c91bf98a1cd189ef7db9d8be5 SHA-256: 3c6b992ddee9ad923b95964910eac42bb0ae0c3c58ee1f35bbbf24d52c3a3cba
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

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://huntic.ru/uplcv?utm_term=normal+vitals+3+year+old PDF link annotation
    • http://okuninka-biale.pl/userfiles/file/fetavekavififiminaluvex.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/dumutezofofukuvu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/rofut.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/17169394152.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///45971201142.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/jopizi.pdfIn PDF document text
    • http://philipsphotographystudio.com/3057945996.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/4590561727.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9fc9c4a637b5bf6eba32de796f0eb22a/67786876553.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/dujuviritanekubavuvol.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210906_054824.pdfIn PDF document text
    • http://hk-keber.de/images/file/rinikagadi.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/xejuk.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/33137062501.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/93578905808.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/kikorejamawokigozipoj.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///gurukimobowesofukefobopo.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/69339075833.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/37944919159.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/jivatalalakud.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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 10636 bytes
SHA-256: e5a49d49789298d5d574f522659c684e4f9ad996e62dcac6513014fe7adc5f58
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 16836 bytes
SHA-256: 20b8e052d2bd4930b438bc738256b6f9bd21fe6549c347cbbd3563ced0ca680f
font_02_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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