Malicious PDF — malware analysis report

Static analysis result for SHA-256 b949a65ab5a093e1…

MALICIOUS

PDF

107.8 KB Created: 2021-03-31 08:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a6202c6430a324cf1bb1eb682b7184f2 SHA-1: abb3bb875a41360ed64f375c8e082504aa45c1c1 SHA-256: b949a65ab5a093e11ecda3d52752c4cbb4c5fc760afc2d566fde2a6119f1ce95
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('mezovuduw.ru') that is flagged as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

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://mezovuduw.ru/strik?utm_term=how+much+does+2nd+grade+teachers+make PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd0a12534773.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/H2Ojdtf/nozozegog.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/hIzgjXo/ruduvejugopusawumibo.pdfIn PDF document text
    • http://zhk-rekord.info/basic_electrical_engineering_notes_vtuodc3u.pdfIn PDF document text
    • http://fresh-ita.space/11381872101zhysg.pdfIn PDF document text
    • http://itwow.info/g-_stomper_rhythm_premium_key_apklhnil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_6027749663e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_605ffdcb73039.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/cHBUJP8/xenoblade_chronicles_2_chapters_wiki.pdfIn PDF document text
    • http://shoop-fn.ru/architectural_drawing_definitionje2uf.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/jijtigF/hello_neighbor_hide_and_seek_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwokujuwe/fgfhjtz/creative_destruction_hacking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_6016b906e3d26.pdfIn PDF document text
    • http://online-sistem.site/metformina_vademecum_mexicop7hmp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e526c8c-6d1d-472d-b840-b36e372497fc/math_addition_worksheets_for_first_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80775477-9ce7-4d68-9a24-3cf4faed048d/favivuvurutepomefaxoranas.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/crusader_of_light_warrior_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/what_is_greek_culture_like_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960c37ae-f9be-4bf7-a4d1-83fb6f213cc6/theories_of_motivation_business_tutor2u.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_off000167dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167DD 5568 bytes
SHA-256: 8dc6b631bbed65ac940e0c6f226cdd39dc1d886bc8a77558e492e88e41b1bc93
font_01_sfnt_off00017ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB6 11268 bytes
SHA-256: 86821ba1d173c74f67b0aeeb1a53cc2e4401c4a6c8581648ac274e26ee723602

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