Malicious PDF — malware analysis report

Static analysis result for SHA-256 733e46b1d6f2fec3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 00:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be8cf7ffd9efcb9ce4cba7b21e186cee SHA-1: 51aa3e71d57ba21fccc8cde855f9c2d009097c68 SHA-256: 733e46b1d6f2fec3c6b6f2cd64964dfd50d907ac86fa3b39ea27b52660c7d164
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the linked content. The embedded JavaScript likely facilitates redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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://posaonakosovu.com/ckfinder/userfiles/files/29981600522.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xesoxesobog.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161339cb9ed177---63967162300.pdfIn PDF document text
    • http://zerosquareonline.com/file/69919036146.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/64895872049.pdfIn PDF document text
    • https://actorconseil.com/files/file/38933543290.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/50817233302.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/renebupojivugupikabawaf.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/84144322752.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/46501519156.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/17927829196.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/manowuvotepoxebat.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/50549436543.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/68546033994.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lipudorefowapataxaxugeb.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/80915234375.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/18532517666.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zusexekagodusuw.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/67688304083.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/66957679343.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/47060740463.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/44274437833.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/xevugusinuxibulawedariv.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/dajofipanibanulofetufuxe.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/83399419077.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/13485423302.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132954f2fa38---lukomotekixepikasowuzol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+more+emojis+on+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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 14712 bytes
SHA-256: bf4c626fab4320ecc777ace69560bbe4c90e32049ab725b78c056a8e2b3f5a65
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10752 bytes
SHA-256: e55a4e0436ecefc7f896af1f4784853fd346ddbb49256d4cea5facd7773d4ea1