Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a43028fb0182e5c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 10:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 825a5901e77bc100f810032fd05c0e58 SHA-1: 0a404ff53b8281ff9c14631fcedf2270977bc846 SHA-256: 9a43028fb0182e5cdb2e27f7c255d2cb0ee1591730d51a8e05386bc9e153c3c6
126 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, identified as a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The presence of a link farm and the high ML score suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hkwwta.org/userfiles/79496822929.pdf In PDF document text
    • https://mosconi.net/userfiles/file/99298294814.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/fafibuzurikutisepuzivam.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/50451597100.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/65479564704.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614136f3e6fb5---gomagefojasidebuj.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/luwogukekefepikotesa.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/xiginofimumabebalufosize.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/banisabofeb.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/35908158491.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/ramudakatepikovuw.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/juzokotagugig.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4f9b1a96---35984048112.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wuxol.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/37863900083.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lavavefununofewamuzokix.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/luwosapekolojipomoxopakel.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/7538211865.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/75484498093.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/2384662380.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18873381805.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/lanipepiv.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/zuxiluk.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/20648851348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=blackjack+unlimited+money+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB062 10896 bytes
SHA-256: 72e308684aa1896c4d241691241b40bc2a29dac45db1fc1948d11b84941ef3d8
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 15512 bytes
SHA-256: acff86cd5af74a757d6977d11bf5e6bdd551b71a34b879388cad840599c71a34
font_02_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1