Malicious PDF — malware analysis report

Static analysis result for SHA-256 785fdb0c7c1e5bf2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 10:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba202442050f8a1c91f52abdcc389742 SHA-1: 5513116c43241e6ef94d287c915072571f03e23a SHA-256: 785fdb0c7c1e5bf22df0826c4daff9938a004c7d5f157c92e8472b359e3175f9
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 embedded JavaScript likely redirects to external URLs, as evidenced by the numerous suspicious links found, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://hatinhjobs.com/upload/files/figijijibogo.pdf In PDF document text
    • http://boxethai38.com/upload/file/wonubofujararima.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/venogutodu.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/winijuzawulexobirapulowov.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/kozumagukar.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zelodolokilipurikaxi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613879af61703---49570347154.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090207321367.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/robokewezuwowogale.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/xexisefasilu.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/feduvabalefowifudeb.pdfIn PDF document text
    • http://snsi.jp/image/news_file/92875169243.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/10346645250.pdfIn PDF document text
    • http://yejida.com/userfiles/file/729333299.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/89569711672.pdfIn PDF document text
    • http://birdwatching.sk/media/file/31465419594.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/tegiweledirosetavad.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/12140225780.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/memegovasogadu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f7abvn6gf7ci3hv0ltlfq7c9i1/5080635414.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/66078698022.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/3928464562.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/508518350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=silent+film+app+androidPDF 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_off0000b8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C7 16108 bytes
SHA-256: 1507f91c83c9e017724fcc18cf6abf8b9a24cbec0439f437cb0f82a0e5a9be35
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10564 bytes
SHA-256: 62bea207379019d13785a2d2d3fa80c6b3698901404339f0b8aef937fec54b9c

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