Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca484ed2168f100…

MALICIOUS

PDF

80.2 KB Created: 2021-01-18 16:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 289ca7eb156049500a915c84f78101de SHA-1: 6cfe6e9843a08e71f3980fa65fb4e9e77c042554 SHA-256: 0ca484ed2168f100a4770a12aecf0e3f3b29c111c2c70500377a519334acbd5e
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'jacksth.ru'. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document functions as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://jacksth.ru/wb?keyword=space%20life%20experience%20maplestory PDF link annotation
    • https://site-1176840.mozfiles.com/files/1176840/51136156635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_5fd10c54db324.pdfIn PDF document text
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/nevovugatil.pdfIn PDF document text
    • https://site-1255795.mozfiles.com/files/1255795/american_express_canada_report_lost_card.pdfIn PDF document text
    • https://site-1191950.mozfiles.com/files/1191950/tor_browser_android_review.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/hhbEghn/spirit_halloween_pinata_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/a1jaIiz/pottery_making_classes_london.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fe69c7a3720d.pdfIn PDF document text
    • https://site-1173984.mozfiles.com/files/1173984/free_usa_green_card_lottery_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fc13ccdc9873.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/b2d630ca10a.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/8853903.pdfIn PDF document text
    • https://site-1246006.mozfiles.com/files/1246006/34280712384.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/7a68ee21c687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fda9255d74a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebogozomusedom.rf.gd/vs_platform_toolset_v110.pdfIn PDF document text
    • http://fonajuwowo.epizy.com/apeman_ip_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/54560024571.pdfIn PDF document text
    • http://rerodijunenema.epizy.com/chicago_manual_of_style_guidelines_quick_study.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 5436 bytes
SHA-256: 1d058540fd5990817b97d7a233cbe0efdc0ace6428587830f0d4edde9757d484
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 11504 bytes
SHA-256: 8e9c658a42b806a126cf87f37eb5feaeb6365060a0f809d3e6c1c91ed8282665

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