Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fec98ebcedd30fa…

MALICIOUS

PDF

91.0 KB Created: 2021-09-17 18:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d47cd55ee361e8bd6c337f0a95daa715 SHA-1: 03de9504be6662dd4e27e1f635da2fc037e13389 SHA-256: 5fec98ebcedd30faf0a0c298fd47f9f56ac81b9b39031ac5c1bffbcf87b50c0c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=codex+gigas+latin+pdf PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c95e704ce2031a389071c8fa2afc0a27/15600701615.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/21374335191.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/13310321143.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/tonezamogefoj.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/motif.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/96117108506.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/saxiz.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/gukojofetorinopasidot.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1971937648613fd2e603008.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/33275286929.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/bulonetopotajejijib.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/xosegasejozeliparatajigax.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/fepis.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/57184163307.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/josepavojagonovoduwadev.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902035509.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jolivupasogomanokeweru.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/14978716582.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/wugedatiwesupef.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/41961340594.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/46560197434.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/dedoseseb.pdfIn PDF document text
    • http://abworder.com/uploads/files/zunakekajuvewebuw.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_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 10708 bytes
SHA-256: 21be1d43f3c35c800fd6c9f70035549c55a565f67b31c7e89090fad488ad9e0f
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 21960 bytes
SHA-256: 72a4f1e9961595eecc71afe2d2488006aae1d3367b2a38493a6906623e4f5595
font_02_sfnt_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1