Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85dd0dbaca74e13…

MALICIOUS

PDF

73.4 KB Created: 2021-03-04 00:38:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d4874427772800e8022fd8074883c51d SHA-1: 9c7245529d8761af0cad9055340e9aa05e4e5b1e SHA-256: d85dd0dbaca74e1301326c2c5d29980b3d2d1da53d4acbfe1ac00a1d15a3fb15
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, masquerading as a worksheet answer key. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed to drive traffic to potentially malicious content. No scripts were extracted, but the presence of multiple suspicious URLs points to a phishing or content-luring attack.

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://kuzutuzo.ru/wix?keyword=classification+review+questions+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404740/normal_60000b810baf4.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/soxuzapibexerujezelekas.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/73512432801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_60397aef23688.pdfIn PDF document text
    • http://tixshopclub.fun/elements_for_design_colorado8kd0r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384037/normal_60062e1d2d177.pdfIn PDF document text
    • http://espaceclient-cmb.com/gadanigunalofoziwq36uu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fe778ea42306.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/bissell_expert_proheat_essential_user_guide.pdfIn PDF document text
    • http://povar2020.site/6365305700806br7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/answer_love_myself_lirik_terjemahan.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/gizavubevaxu.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/international_truck_parts_houston_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/1126684170.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/kendo_grid_column_template_data_bind.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/41817720884.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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 5316 bytes
SHA-256: 2f031297ce482190a5e8305d4ff79044d60ddfd9217adf705274a414af73cb55
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10352 bytes
SHA-256: 9d3643fc3b018b64c8801b4a97be890601ff521cf5914fade680bf59dd479d36

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