Malicious PDF — malware analysis report

Static analysis result for SHA-256 785475f8a6569f97…

MALICIOUS

PDF

165.8 KB Created: 2021-10-05 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 28fe6af8529e28fafc806b3e31724be7 SHA-1: 2fe69463b6fa7b112a5d62b6000dd8753863c765 SHA-256: 785475f8a6569f973bf2e26848c6d8577851605e05e69423191c1dc48d350127
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=i+feel+good+chords+james+brown PDF link annotation
    • http://conganbacgiang.vn/app/webroot/uploads/files/lozesenijojabife.pdfIn PDF document text
    • https://udruga-invalida.hr/files/61531440249.pdfIn PDF document text
    • http://indemo.pl/Image/files/gazumagonazotir.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/bolipege.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/92643341020.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/84531826694.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/53667107845.pdfIn PDF document text
    • http://dsagco.com/Upload/file/33078896208.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29218861293.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/61436015420.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1a26f494---86805865554.pdfIn PDF document text
    • http://carszana.com/image/upload/File/757919396.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/96664665619.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/gotadawaxepibaxude.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/90131098265.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0adb8e2c6e78a5151ec2be2f14694f94/pesitufitodudibudefekiw.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/13092107635.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/soxutovebusekafere.pdfIn PDF document text
    • https://loyd.rs/images/file/60597369253.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021105547576533.pdfIn PDF document text
    • https://e-midas.ro/files/file/bulemomezirixaginisonono.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/xofunutojiwabadidojukab.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/24180065860.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/metowejefuzifek.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/12319748941.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zisazoseduvabuw.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_off00021de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DE9 11040 bytes
SHA-256: 113b1091bc723e7f5a2e46c7af6184177059adaaa7a2fc359fc0fed476c06a63
font_01_sfnt_off00023747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23747 22592 bytes
SHA-256: a538941890cacd75a29d04a408bc9035a96eaeed0f896a685723adda4c452dc3
font_02_sfnt_off000270b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x270B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1