Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c65cffe79a0a318…

MALICIOUS

PDF

73.0 KB Created: 2021-10-06 01:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0182875c7b0a4b2b718c7eba6676aa46 SHA-1: 2284f2af069417eebf27dc550957f520c560f000 SHA-256: 4c65cffe79a0a31841bf30380568684dd7cbcac53245138d2f1fe38240572931
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=samples+of+narrative+reports PDF link annotation
    • http://dinhviht.com/images/newtech/files/nalaja.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cb7d85ade27ebf41f83da2b80e8c0b00/77320975888.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/87253788021.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/13413353288.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/52004912786.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bsacpeot4c84glt8kdv5cltrim/7553491601.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/pijilixedulevuwotuvaxurar.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/13062803575.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/16450450500.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/denadoxaz.pdfIn PDF document text
    • http://wych123.com/upload/files/79308464770.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021100100053312.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/wusezepezaled.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/likesoperewa.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/nalewanejer.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/masoxanemanaturejupawutup.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/55879524388.pdfIn PDF document text
    • http://africareview.in/userfiles/file/70076421881.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090922203480554.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/derupuju.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/zikopenupiludexiwuluk.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_off0000bd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10660 bytes
SHA-256: 08dcd7a7b1f477b9d5c079aad9ec7ba4028441b5aa49cba501619c4f2d34a43c
font_02_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 16036 bytes
SHA-256: 858f3fb95f04def62823a6f5b4ff2e0172df1e1214631e1fe17a395a984e9eb8

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