Malicious PDF — malware analysis report

Static analysis result for SHA-256 230ca113ca8c8c14…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 10:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d498582c9da9342990860f5d63e9c5a2 SHA-1: aef07a717b0b948db37452734e29623c9f778ad1 SHA-256: 230ca113ca8c8c140019fbb8d07eb39980a44c51de04987231cfe96ec0c1fc3a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to lead users to malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://himalayanthailand.com/image/upload/File/50808849036.pdf
    • https://superpackeg.com/userfiles/file/kamixonuxewokivugila.pdf
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/13283429243.pdf
    • http://rqconsultores.com/userfiles/file/nulamomokujupujasegito.pdf
    • https://tarzminder.com/resimler/files/winoxidalazi.pdf
    • https://yaofangpeixun.com/upload/files/xerat.pdf
    • http://kaupa.cz/userfiles/file/14600798351.pdf
    • http://www.deewanalarab.com/up_imgs/70504959657.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/moxifafedugajewa.pdf
    • https://ckmandarin.com/uploads/8738862266.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0e756343---1982039540.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/xuwipumasirifazib.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/54485026029.pdf
    • https://nusbetaja2.com/contents/files/lojijisizebipola.pdf
    • https://drddvichitra.com/userfiles/file/lutuge.pdf
    • https://sergeca.com.ve/ckfinder/userfiles/files/88836842549.pdf
    • https://1000families.eu/userfiles/file/gijegamubemolemeti.pdf
    • http://olymp-kiev.com/temp/fckeditor/file/tuwinojurafi.pdf
    • http://millenium.moscowfashion.net/content/xuploadimages/file/98260780474.pdf
    • https://quatden.vn/webroot/img/files/86054464180.pdf
    • http://96stone.ru/userfiles/file/7241393304.pdf
    • http://hcbarrett.com/user_area/file/6332869510.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/wesufikisobukajasitot.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/luxifixoduxitodejuxaja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+whole+new+world+violin+sheet+music
    • 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_off0000d64a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 16792 bytes
font_01_sfnt_off0000ee61.bin
2fc93e3b8801da672394b012eedce2d24784d98af0b6f26f777376db5d787959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 10708 bytes
font_02_sfnt_off000106dc.bin
3162d6686b8e3bb0a0e6735f9413911d0207bf525043aae4aa5b83e52dee7cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 17148 bytes

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