Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5cb3741e64ba8…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 22:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5c123dd932bceb0c23fcf41be4541da0 SHA-1: 69418cf3ecea84141a83e150178bc68eed239dd1 SHA-256: 26d5cb3741e64ba84d4f8d8de187392e81e154295f8900eb98a0113e4d2c13bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL leading to 'xajibur.ru/strik' strongly suggest a phishing lure disguised as a search result. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=vizio+vx37l+screen+adjustment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403680/normal_60160cbba9cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_603cc96e8867b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd640f6e4ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_5fd94ae3d8bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_600d5e42e08a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_601387a01ff52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_6037c57772f9e.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/nelan.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/how_do_i_turn_on_voice_search_in_google_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_6015ef5355477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_602705ccd92ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5ff5942659293.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/harry_potter_und_der_stein_der_weisen_hrbuch_gratis_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_6017409b5a35c.pdfIn PDF document text
    • http://vofufime.mypressonline.com/74954753776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fff4c995a0e3.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/59824227983.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/fuYgTk8/guvadazowasuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_6039abbe2aaf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafamikipu.epizy.com/magic_video_converter_pc_software_free.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/formas_analticas_significado.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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 5548 bytes
SHA-256: 55991a6fd12f7fbb374368e9b81da1f1e116b66ce389b23c8bffc03ac1d665ff
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10632 bytes
SHA-256: 519d628155e1f02639f1515e70d72a9254058fab41075452f5507a32903de793

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