Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ff4a74a0f63822…

MALICIOUS

PDF

96.3 KB Created: 2021-04-22 21:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 77cff8492fa0881f283ebc83cf08a85b SHA-1: 2e50ce9f5dded372735890359ec9d503d387240c SHA-256: d1ff4a74a0f63822bbc3dc9b8e4ed43cdf31670275f234839ef70d6f6aac31c5
126 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 is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to reference a book title, likely as a lure. The presence of external URIs suggests the document is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=the+mediums+book+allan+kardec PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ff50ee73cf21.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/7em4p9D/leruvuvotope.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/shatter_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/bohdhge/1762104545.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/wuzosikumitukamenisur.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/cuantos_metros_cuadrados_tiene_una_manzana_en_nicaraguaim5xu.pdfIn PDF document text
    • https://cdn.sqhk.co/xisusituz/lhLRcqN/35120582073.pdfIn PDF document text
    • http://fakts.design/adding_fractions_with_like_denominators_free_worksheetsn9k8l.pdfIn PDF document text
    • http://rerubin.space/77903352947qkx54.pdfIn PDF document text
    • http://zonagareme.getenjoyment.net/22293042166.pdfIn PDF document text
    • http://gixibuni.22web.org/53893353203.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/rjiG8ij/pefagupipukabadawe.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/cosco_scenera_next_dlx_vs_next.pdfIn PDF document text
    • http://milanomoda-italy.website/weighmax_pocket_scale_calibrationcszp1.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/47004243453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_6045f24deee91.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/biomedical_science_graduate_cv_template9s1ze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe3e9b96f830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_604f5246d408f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fca955d788e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafagelupuf.myartsonline.com/91384945311.pdfIn PDF document text
    • http://wasalesex.epizy.com/mekoxidazebotagatetubadin.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/38438118553.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_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 5332 bytes
SHA-256: 01cf87ec41de0df99740af2d9b44136d2929633ecc8a698fab7c32a211e0a0f4
font_01_sfnt_off00015040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15040 10460 bytes
SHA-256: 1da710c7484465354c3d88554df0eea2f3f8067955cf14864e0f892541a7e86c

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