Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7770ef8a469bfd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 23:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91b20eaa93bffdf379c3ac1c41524687 SHA-1: 98ffded2a7803f40cff8acf35cc6dcea7a965a09 SHA-256: 7a7770ef8a469bfdf4eff392d037c9960632c46d6a348f712d0be1cae8b2d49f
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, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest a malicious intent to redirect users to potentially harmful content or exploit them through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://a-metal.e-giant.net/archive/file/files/punalexovojiwimowareraro.pdf In PDF document text
    • http://wawabed.pl/uploads/userfiles/file/14915121231.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/tezozasumalidufux.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/polerosilanesesulip.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/duwefokevulaz.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/24606195377.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/58400508498.pdfIn PDF document text
    • http://imbirimbir.ru/files/ditavuj.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/lobupide.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/nilarexenamupugakavajox.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/83387317059.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/57550812618.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210906140547.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/24457176862.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/kigasavumitukesezuw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cc7f385e4---samebotegozakupebu.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/31886317832.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/71216067068.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/7792534429.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/69100250837.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lipaxijoratazi.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109020719364284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nokia+android+phone+featuresPDF link annotation
    • 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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 10716 bytes
SHA-256: 31c4e95559e9cacdfd54f7f259117b2db0b1289d0cab58e99547375717cf7ae6
font_01_sfnt_off0000d2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 16856 bytes
SHA-256: 1600748359239a1e74e32b2887c4da988892108adec1621101d347aa911a5ebe
font_02_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.