Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a53d39e5a13fec2…

MALICIOUS

PDF

79.2 KB Created: 2021-10-01 08:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e68274de5a9439cfeb4b84090fb9c4ff SHA-1: ceedf3d307eb71d8be16e3f2d05764ae35b12b75 SHA-256: 5a53d39e5a13fec205c00e12e67dc0c7d9c5e95551ee1a7d828318bd2059a8e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://giorgiosantinelli.it/file/97240278604.pdf In PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dereve.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/69602669061.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/35412058301.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wotimudizenijovede.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615226d42dd8d---38299105984.pdfIn PDF document text
    • http://ativn.com/upload/file/zesizido.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/31163352769.pdfIn PDF document text
    • http://contextuae.com/resimler/files/35784712162.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/98845645529.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/22781734630.pdfIn PDF document text
    • https://tckontrola.hr/files/3160933465.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/vavopepuvivupenareleb.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/vepiroteruzubusepogodo.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/3285236696.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/judipovupowokoxusarif.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/mugomemubo.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/34206375008.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/pefoje.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8adc4161d9c35ea8a9a44552ede1242a/vewoxugusaporekoro.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lugesonunaxuta.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1632713645/file/53664026278.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/wikesufogipemutapofobora.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/lemawinemejawomuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+pokemon+x+for+androidPDF 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_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10672 bytes
SHA-256: deb21ed2ea78fabe7e236850f93f20084112c77ee6846ee863674a96f70a7958
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 21644 bytes
SHA-256: f825b65b8d29a142e88be18a3832d53d4f97fe901a26443d77942417e8716503