Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb4f81e2fc43393…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 08:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55c4eaf5727abbf1e679fbfc2d8b03fa SHA-1: a35010e499283cb42fc7f46155bb66593525cd39 SHA-256: 1cb4f81e2fc4339368b6176c3c804b30f07fe44689133cf7c5cd276822ca0f9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The presence of external URIs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ngaa.org.au/application/third_party/ckfinder/userfiles/files/29270686593.pdf
    • http://bezagsecurity.cz/userfiles/xuluxudizefu.pdf
    • http://travelport.pl/userfiles/file/47933180945.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/40811956090.pdf
    • http://tiszaladany.hu/upload/file/40195222800.pdf
    • https://tresonance.org/uploadfiles/karoxupezevapupe.pdf
    • http://fermobkorea.com/userfiles/file/20210905001437.pdf
    • https://uleiuri.ro/userfiles/file/kisefamuzoxew.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/kenifujuw.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9ef79bf9---61290643023.pdf
    • https://www.idd.no/ckfinder/userfiles/files/40797868531.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f06cd8e5---noruxilutigiriterutaxe.pdf
    • http://shengnabei.com/uploadfile/file///2021091122510215.pdf
    • http://ifap.it/images/file/11414396956.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/60132226099.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/90450265134.pdf
    • http://esipro.lu/userfiles/file/13129256055.pdf
    • https://mmoxx.mn/userfiles/files/10079887146.pdf
    • https://encoyun.com/calisma2/files/uploads/duvulabulefilijegotojuvew.pdf
    • http://tiendanatacion.com/noticias/files/rezudegonejoxamevek.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161391b2f381ae---45120625932.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/21543351116.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+pokemon+smeraldo+android
    • 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_off0000c814.bin
0c8606dc089b57dcd63806a33e318a7b8b98d7c5abd27ad9d7705fa3306da592		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 18516 bytes
font_01_sfnt_off0000f85d.bin
434e1b8e8c8d2a20f4bfe4977fe76f0201f6309fab011bd55e1642ea27c2f7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10636 bytes
font_02_sfnt_off000110ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 16792 bytes

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