Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6aa3bbd05f83e4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 14:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95103d8ae98520134a07b1f6d88d6796 SHA-1: 68bb9cf1622d25327ce82fe9e3ddfccf2b13a370 SHA-256: fb6aa3bbd05f83e4721cd269b591c63bce9c809cf6e1b2d73ffd04a01aaed69f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic identified a large number of embedded links pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection suggest the document is a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • 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://shreeaksharinternational.com/webroot/img/userfiles/files/51538523602.pdf
    • https://coverline.ro/userfiles/file/29748536008.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/josuziz.pdf
    • http://cdjuchuan.com/upload/files/doxaruta.pdf
    • https://capitolmodels.tuzonanet.net/userfiles/file/1240078793.pdf
    • https://cartolmania.it/file/zumunalugunutavatutofubos.pdf
    • https://nezrenweb.com/calisma2/files/uploads/4307295830.pdf
    • https://tavcam.com/upload/ckfinder/files/bofesububidivasefinekuke.pdf
    • http://mrpokedb.com/uploads/files/jesogele.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/19176105678.pdf
    • http://mega-treid.com/userfiles/files/nedikesamaxekovarijugagid.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/049251f1c9b9f753065e2cf9999c8e1a/51429889573.pdf
    • http://amrapalispot.com/userfiles/file/zakesowite.pdf
    • http://adice-area.com/pictures/files/57058509891.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/wovilutosurulugexojif.pdf
    • http://peter-scherer.de/userfiles/file/bupefixog.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/79117004143.pdf
    • http://constantcontinuity.com/membership/data/files/29093090749.pdf
    • http://loadcell.vn/Images_upload/files/13162082246.pdf
    • http://autosoftware.company/autoresponders_images/files/woxowipivudativopufulif.pdf
    • http://mientrungland.net/uploads/image/files/miziloj.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/kutezoxujivopi.pdf
    • http://lev-steklo.ru/userfiles/file/10893189556.pdf
    • https://rent-1.es/ckfinder/userfiles/files/lipubetamo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=aplikasi+pindah+data+iphone+ke+pc
    • 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_off0000b163.bin
4b4ee949256e977eb0be96e9981f945fefabf0f4683d52bcf46c617bfce035a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 17452 bytes
font_01_sfnt_off0000dd47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
font_02_sfnt_off0000f55e.bin
d0f106bb19a46177d78a8eb8e4e4e425e77801894d4bebfacfb84d4fa8a18875
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10584 bytes