Malicious PDF — malware analysis report

Static analysis result for SHA-256 05df8638ab04eac2…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 03:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6edb332c3a5656d2db32a3bbb17dc3d2 SHA-1: 20d5c22ac628bccc467ba3ceaa5fcafdba9adebb SHA-256: 05df8638ab04eac2f76cc4f87728420ad483ce8e9de8c1656a8ab23e4dde54fd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious intent.

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/123?utm_term=first+90+days+in+a+new+job+presentation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417024/normal_5ffc476c48efc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_600d838a416e9.pdfIn PDF document text
    • http://7gusevshop.website/bsf_bharti_online_form_date_2018btaeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_5fd13779264d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_60200b1934f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_6009c463899dd.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/jajfMjc/horizon_nj_health_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fc8396246e91.pdfIn PDF document text
    • http://youtube-subscribes.com/gre_quantitative_reasoning_520_practice_questionst5l4m.pdfIn PDF document text
    • http://good-production17.site/22544278912lelpz.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/Vzhieha/wijititozi.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/computer_coding_languages.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/dAiigja/21215031607.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/misbehavior_of_markets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sogivuwe.onlinewebshop.net/xaxixumofazibufat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 5372 bytes
SHA-256: 52aa2fe1a4cc26dba58500a93b3d511e099b0d8e54436d6cee1816409287fada
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10844 bytes
SHA-256: af29ee141d3ac94897e3bb094faaed0a55491df0ea6ddf2665f60e7047b48078
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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