Malicious PDF — malware analysis report

Static analysis result for SHA-256 116962b47f342fe4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 11:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 039c3d31199eb541e50af0055df1e30c SHA-1: bdbc5a5472dcc1bfb35402c773a5172b3eb9f56b SHA-256: 116962b47f342fe485df74b92fa4bfb523d0deeac0375ee6985a85841fec1760
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=moy+7+the+virtual+pet+game+mod+apk
    • https://0286869143.com/editor_images/files/tirubexev.pdf
    • https://floresdeserrezuela.com/aym_image/files/15701546628.pdf
    • https://0900107678.com/upload/file/33854821511.pdf
    • https://merlak.ru/userfiles/file/14597519309.pdf
    • http://7166867.ru/ckfinder/userfiles/files/nejizulo.pdf
    • http://atthaya.com/file_media/file_image/file/vokefuwabativowebekuf.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae4161278f238c930d728fed234f414/5629098424.pdf
    • http://vivo-mebel.ru/upload/file/sebewizemivixipado.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/xowiwedugegov.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133592337176---bufati.pdf
    • https://dalycity.com/wysiwygfiles/file/nagatikukitutixovusurat.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23164697520.pdf
    • https://saksisan.com/upload/ckfinder/files/50525733359.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/11761414083.pdf
    • http://we-women.de/default/files/uploads/file/87961211986.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/norelulipitologejuledupa.pdf
    • http://nanoservice.cz/upload/file/80746799824.pdf
    • http://kaie.org/userfiles/file/20210912155643.pdf
    • https://ijfbacknumber.com/editor_up/savevefoduniron.pdf
    • http://7m-shop.com/userfiles/file/53563440200.pdf
    • https://agrando.cz/files/file/97064523237.pdf
    • https://hoatuoi360.vn/uploads/files/3769262595.pdf
    • http://kmkonsult.cz/userfiles/file/vetotajajigoja.pdf
    • http://77owship.netsociality.com/upload/files/wejefavigati.pdf
    • http://thamdinhgiadaiquang.com/img/files/43826266499.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c549.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC549 16792 bytes
font_01_sfnt_off0000dd60.bin
0d69958142d53fb9c3a9cbaaa968d6e3f29f478d34ac32c7ab69e6062fb06064		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10984 bytes
font_02_sfnt_off0000f6b9.bin
a3d9668f5ab71323c1685cd3b4a87f6d21ff60bbd1fc2212ea322b3763b80d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 16208 bytes

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