Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cd90051c429f1e…

MALICIOUS

PDF

92.3 KB Created: 2021-09-11 12:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acfeac685780f9ea90d5381fb16c777d SHA-1: 9a6eaadd486c2b2763fc30eb6e82be9e0372efe7 SHA-256: e5cd90051c429f1e2d73298d8e7ec0a373bb05024ef2f5fb9f03a6dd15a149a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many hosted on disposable domains, suggests a link farm or phishing lure designed to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=source+code+game+android+studio PDF link annotation
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/11520585002.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/41159202758.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109051806596722.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/24930438683.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/fekivagivowow.pdfIn PDF document text
    • http://kco.su/userfiles/file/56672916946.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210903120340799773rsom1c.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/wamofubonevuvunefubupej.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090602163473499.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/31460368305.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a64bee46d---lezatumoko.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/bupumelukitava.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/59312331988.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/32188550737.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/gitimezeloru.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/12636976333.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/96885611466.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duwotemoxali.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/gatetelo.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/35794929955.pdfIn PDF document text
    • http://telektrans.hu/editor_up/97811366086.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b40a67736---98984418940.pdfIn PDF document text
    • https://matratva.in/userfiles/file/40160799892.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zeritumarelituni.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/wagud.pdfIn PDF document text
    • 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_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 17648 bytes
SHA-256: 35863abdfdaa0ec26aa0f74d3e4297d746a09ef2dfa73edf83861064e0dff024
font_01_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4E 10844 bytes
SHA-256: 62bc0a9b5b7014bd0de95fe506f36f9d43cd73a82d42fa1c59fbe2332f01cd91