Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4f9ddb16586c27…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 11:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a1a97cecb23995b5a4acec7a1fa041b SHA-1: e78f8020990106259d44fe4e1307a3923f3802e8 SHA-256: cc4f9ddb16586c275b0deb39584be5eb70023540a8446e1cf08ce028a5ff2217
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of a link farm on numerous disposable domains suggests a phishing or malware distribution scheme. The document body was unreadable, but the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://weddingdove.tw/uploads/files/202109081253086749.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57701912851.pdf
    • http://smsgurugram.com/miet/assets/files/madivorukibisu.pdf
    • https://aldwalia.com/userfiles/files/vaxapokawabed.pdf
    • http://studiobonvino.com/userfiles/files/74930588184.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/resupapokakogazapivakefe.pdf
    • http://denprokhorov.ru/images/file/19588520259.pdf
    • https://laurallo.com/ckfinder/userfiles/files/puzenopo.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/jesuwanivar.pdf
    • http://comitatoamiantovelodromo.org/userfiles/file/gobolad.pdf
    • http://propertiesforrent.com/userfiles/file///kigusido.pdf
    • http://energyexcess.com/userfiles/file/12380854746.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/95960390307.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ebc2303a---25441325688.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rogubi.pdf
    • https://ubk-sad.de/azubi/userfiles/files/2192719789.pdf
    • http://titusauto.hu/kepek/file/33726735091.pdf
    • http://b40555.handyfriendship.com/upload/files/fuxanupesavigiburi.pdf
    • http://dasbluemchen.com/86241138284.pdf
    • https://pakistanchristiancongress.org/userfiles/file/zuvamevotigoxopagug.pdf
    • http://www.alfapilates.pl/upload/file/97106299512.pdf
    • https://thietkeweblongan.com/upload/files/xobabobopitifazeweniw.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ben8s8bb3nse5obt2gpojj0920/rofibolik.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/28352856277.pdf
    • https://wodepcb.cn/uploadfiles/files/fufomiruwomejeponuwa.pdf
    • http://www.fashiongale.ro/userfiles/files/66056227717.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+sdk+on+chromebook
    • 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_off0000eed2.bin
e36077cae4af54ef2fdfdd6b703ce72dcde015db2eb03391469569421328889f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 20180 bytes
font_01_sfnt_off000123a5.bin
a2a380708242614ca5262e91465e2df3f5b512a44c985ba8cd7141bb228432f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 10540 bytes
font_02_sfnt_off00013b74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B74 16792 bytes

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