Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fa3942237533c4…

MALICIOUS

PDF

75.2 KB Created: 2021-06-10 03:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 41651ce5bb7bb18c7a794c8440b092b4 SHA-1: cc6ccf9e6b25e2b577c309d082b89fe48b0aca32 SHA-256: 26fa3942237533c4135041bd6eaf13cc3b5ac8a7b4e063409833101013685eff
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominently featuring a deceptive lure for 'ultrasurf 19.02 for pc windows'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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://laborke.ru/pbw?utm_term=download+ultrasurf+19.02+for+pc+windows PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fcc8d52924f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_60153959459bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_606e48e608613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fd9caca42429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_604e2bb2635b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6016643527e96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5feafb8f8f4c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_602c4b9744803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5ff41afa4cf94.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482863/normal_60b5c83d18ba3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wimarolos.pbworks.com/f/how_many_chapters_of_dragon_ball_super_are_there.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144468297/lowebivotawixawelepax.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/mujowulu.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/senior_account_executive_job_description_advertising.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144511947/who_sings_the_song_dont_mess_with_my_toot-toot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a074fb76-6cf7-4fe3-b2f8-a3b6ac2bdbfd/56995894763.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144515241/ete_to_vce_converter_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ffed5a-e98b-4c6e-8327-d57f96b37f0d/what_comics_are_the_marvel_movies_based_on.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144414738/velocity_time_graph_worksheet_answers.pdfIn PDF document text
    • http://nijominem.pbworks.com/f/nse_chart_analysis.pdfIn PDF document text
    • http://viruniruxo.pbworks.com/w/file/fetch/145004355/tuzevaxoko.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5756 bytes
SHA-256: ec5012ae3fb934edba60da6c2a803ee2efe681869f08d7f43493bf77fe1aaad2
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10184 bytes
SHA-256: c5319ca1e381fa115ab76086870256b30380eebff9d5fb9a54bde591abbcdb51

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