Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa12275e8adefe3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 10:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc6bda50bf81a78fd92338b9cb88ca70 SHA-1: b4a8045c98151dc81ee6309c8ee6e630162ab982 SHA-256: 9aa12275e8adefe34e7881ddf83085e12dbc267f9988ed57c202e9c30ef76767
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dep14kirov.ru/userfiles/file/82582565029.pdf In PDF document text
    • http://centroolosprato.it/userfiles/files/zopifikefukotogu.pdfIn PDF document text
    • http://smogy.ru/files/files/wedaxuge.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/jugekomujizowivokanetefil.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/5720323490.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614529950f723---xikanuwurakenakewib.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210913_4E0C251B39E6CB33.pdfIn PDF document text
    • http://guitarenko.fr/img/files/jetebubedo.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/15386034170.pdfIn PDF document text
    • https://airbays.com/userfiles/file/41592129872.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/temaliwamulojupuw.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/86681282919.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/zigopokeduwabodosixi.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/fajogifewamilerepopad.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/loruxula.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/supavibupuwevobamemig.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/wuriridagaje.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/wawuzur.pdfIn PDF document text
    • https://togeltop.net/contents/files/lamofupemudebazadatax.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/47823415464.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/pafuzuzomoxovugabidub.pdfIn PDF document text
    • http://mgrima.com/files/file/1883069744.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/fosufifug.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210903053848540197c3zp4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sword+art+online+light+novel+japanese+pdfPDF 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_off0000b2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F7 15464 bytes
SHA-256: 2f73f8967759202c33c0ea19aa7d0e888589ee2f58ba5d3f4747141e7011acb4
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 11136 bytes
SHA-256: 1e18ee88c94f43a35239c46ea54bceb0f0ec3ac95204cf5c926c1a32f29444b5