Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf2afc0c76242af…

MALICIOUS

PDF

87.6 KB Created: 2021-09-22 19:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d8c64e2271aa4ffbf584ac65051414e SHA-1: 02b5fca75b89a6cc2bff4c4fdc72177a26d2caf3 SHA-256: ebf2afc0c76242af3ae97a9ea4fd3b0ac5060ec34a5e80c1db35a0d2326ad352
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly flagged this sample as malicious. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing lure, likely intended to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://hoangle.vn/uploads/userfiles/file/84622431931.pdf In PDF document text
    • https://jackyrouxmethode.com/userfiles/file/72817920752.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/98756605872.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/80263569146.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/xovosulotibosipinitutowav.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/91463292589.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/14007963174.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/lefilisu.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/11362431998.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4d20ee96---22942875890.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/51837163766.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/sebewosimorezukekulifej.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/2857717285.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xopevujimut.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/46589665503.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/mafaluribezajebinu.pdfIn PDF document text
    • http://mi-stores.com/basketballtotaal/images/editor/file/77030181524.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/dolezerikikipomer.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/topomuxujef.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/78185426740.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/1314811025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=modded+app+stores+androidPDF link annotation
    • https://mediaget.com/userfiles/files/xigitenuvijigigi.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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 17284 bytes
SHA-256: a14828d5044d743e93d7d6c64e3ccb59b57f71fed4cc6572a6cba4930678712c
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 10332 bytes
SHA-256: 4684e8a97452f4cdb82f33104b84d3b8a728aee30c2be9de24d6c2abf53507e6

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