Malicious PDF — malware analysis report

Static analysis result for SHA-256 d490464ea26b28c1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 15:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 328e6ebcc8b45f55b9dacf61f3db2d4c SHA-1: f1d8fd09c70f10ca4e18f042cd6604e9527961e2 SHA-256: d490464ea26b28c1620dc126cac247750bc61c7f06afc07ceda3cb4dfdf56041
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 pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ilsungwarehouse.com/userData/ebizro_board/file/sagulewijem.pdf
    • http://scard.vn/app/webroot/uploads/files/29742274957.pdf
    • http://biblioteka-belzec.pl/upload/files/71229299529.pdf
    • http://dtyxbpzx.com/filespath/files/20210905080924.pdf
    • http://word.mn/uploads/assets/74979576983.pdf
    • https://jkmart.net/FCKFiles/File/77199524977.pdf
    • https://llibreriaha.com/img/events/file/tidobolimi.pdf
    • https://voxel-avocats.fr/uploads/file/
    • http://cloverdiamond.com/file/tigaruvexaroladak.pdf
    • http://hieuchuan.com/upload/files/dosoguzivuvabefaz.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/84104652358.pdf
    • https://contact-house.com/fckeditor/upload/file/1272990537.pdf
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdf
    • http://nadafashionbelt.com/Uploads/file/zowabeledumi.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/71070134988.pdf
    • http://3sdent.com/upload/files/5439990304.pdf
    • http://security-m.jp/tool/images/file/91325490640.pdf
    • http://mistral-paints.cz/userfiles/files/91438195144.pdf
    • https://badanie-wody.pl/galeria/file/65025113335.pdf
    • http://altaprecision.com/userfiles/file/gepipegivuvozajew.pdf
    • https://ph2020.org/ckfinder/userfiles/files/88346104119.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/tobonuxogiluwifagov.pdf
    • http://kmsenior.org/file/files/lerano.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+skyblock+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_off0000be8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8A 16792 bytes
font_01_sfnt_off0000d69c.bin
71cc99b8ee7c9929ab5f73e20dba38e7f8bc9358cfcbaa14a80c3f6712b81b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 15868 bytes
font_02_sfnt_off0000ff89.bin
51bc2f7b6311d78b1b7ded6d4c7fa82c4a4928f69f3a954d5fce2b91f2d51631		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10808 bytes

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