Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a834b57b5fe7feb…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 03:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 87fdc80d88cc882874d11264f07c1059 SHA-1: 094490ad0db0c4cab671bb3e30b9f72ebca7c876 SHA-256: 0a834b57b5fe7feb358cf6fa9aa16e114a861fc5508cffdc23a6d46a17a08dca
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, likely to distribute malware or phish for credentials. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sochisushi.nl/survey/userfiles/files/bipexiwujajoziribagobosak.pdf In PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/31529881061.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fowijawefivazibiz.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gosiriwatejeresuki.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/17106584220.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f27b0877d7bc193bffa2f9b9dc846799/73670353268.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///kuxunovakewofumibupo.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/75513718088.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/96487299485.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pojotono.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/86854901639.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/vupibijado.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/10414888179.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/44805509985.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/gafopijeweti.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/54729023085.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/62196984837.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/valerunumizugewa.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/8576025902.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/20698606033.pdfIn PDF document text
    • https://resicolor.com/upload/files/32864287662.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/67810456246.pdfIn PDF document text
    • http://eternoohydro.com/d/files/mesedoxen.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bemivumemevo.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/kilusalarijadesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=install+spyware+on+android+remotelyPDF 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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 17180 bytes
SHA-256: c59e0180680f135ca2acac3b7f127ffae649a511ef01347ba82490aab1a20292
font_02_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10704 bytes
SHA-256: 86cf24c926e5b5b5726b8f780800f14b06a9ada3b61761e4b0a596c9e4c575ab