Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44283c85fd76328…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 16:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 291118289ebd046fccc7413fdef9c6c2 SHA-1: 4fe0385f84ba21f6e23c645262dd663857baa5a5 SHA-256: f44283c85fd763281224609d2dfc1b9a436c1e5bfa08c88d815be156ff63812c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is used to facilitate the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=music+player+snaptube PDF link annotation
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3666ac4caacd6ad9a33bcf1e4a42dbf8/97587202981.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/25332516497.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8uq8t6gi21u8tbk2v2ruje7kn0/943633879.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/61254049160.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/71734781879.pdfIn PDF document text
    • http://rayanchem.com/d/files/gejibagaraw.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/80739158891.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/guzavelasutefigij.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/83149095731.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/rinelubukowa.pdfIn PDF document text
    • http://africareview.in/userfiles/file/58568866812.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/jasop.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/29319508163.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/vidaxiz.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/59328403516.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/vugejevutijavut.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/81645841349.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/61084921193.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/zulagob.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/witurukusakajugodotogo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wafisivovesogapapo.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sojaxifevafu.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/98026543848.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://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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 10596 bytes
SHA-256: 64dab626f7aac50c463dd10e4542298f1ac15a8bdb828c58b542dbf58782bdc9
font_02_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 20264 bytes
SHA-256: 6481245493627ead049e11b90d651677987b1063587d6495bb154f0e288104f4

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