Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d3e69de2d305cd…

MALICIOUS

PDF

89.0 KB Created: 2021-03-22 23:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4a163ee2d8e15fdb62d34242d464d3b SHA-1: 92cbc02cde6ffa0f6e20030afba41c9686335d68 SHA-256: e7d3e69de2d305cdcef09cc591e730a1f0a7db9008c7d5b10a9ab4c34ddf0b4e
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It impersonates a document signing service, a common lure for phishing attacks. The document contains multiple embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the impersonation lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://leonvi.ru/award?keyword=adobe+pdf+signature+field PDF link annotation
    • https://cdn.sqhk.co/bamopilu/SgfhfGQ/71910496290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_60430c0eb78ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_603c083cf38d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485305/normal_6006a410a3396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_602ab62878aab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5fcb5aac0bd35.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/G6HnUic/48122698376.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/zqsS6jc/nintendo_switch_console_walmart_sku.pdfIn PDF document text
    • http://mukedasimewiri.22web.org/garotup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471995/normal_6019c53827d4e.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/cjdbNhi/vazaxaxibatel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakivexa.epizy.com/titan_annual_report_2020_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afd590a-aae2-4644-9f9f-bb3fe82a57de/what_are_the_three_main_cognitive_theories.pdfIn PDF document text
    • http://katemezutam.rf.gd/important_days_in_year_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6793e6-7d2f-4b44-9398-c96815c280b7/which_statement_is_an_example_of_an_objective_sentence_herbert.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_c991ccf4af7349ca9a6917fb8564ad4a.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_f30f1d52e82842b289e72f1ba38b20d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb8acba-319b-43dc-9483-4c2e9b8dc100/3912986298.pdfIn PDF document text
    • http://worutigije.epizy.com/journal_entries_ledger_trial_balance_questions_and_answers.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_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 5336 bytes
SHA-256: 43e0c7aaaf5bd242d8559a4930be0f8e0a8f9f55b0daa2541471450a47806741
font_01_sfnt_off00012f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7D 11684 bytes
SHA-256: 970c5dd7628812246a64368663c02d87c6d16a902e20ba63edb8895b72b03497

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