Malicious PDF — malware analysis report

Static analysis result for SHA-256 39487571ac410e24…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 15:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2b9f7a3ab6d6b8f2ab099560c38bf217 SHA-1: 9f12143f5ec17c1a6eb14bc257747390c6b463b3 SHA-256: 39487571ac410e24465ca351064abe2319bc7b1a9713bb8ebc28db63b33823de
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://dafemum.ru/award?keyword=campylobacter+jejuni+patogenia+pdf', is the primary indicator of this malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and the malicious link strongly suggest an attempt to lure the user to a compromised site, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=campylobacter+jejuni+patogenia+pdf In PDF document text
    • http://wudebakafepi.mypressonline.com/35614148188.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/22033795399.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/why_is_my_epson_printer_not_connecting.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/68477732723.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/fidulatot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_6fbdade2be2e4fabbd07c406af0f168d.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_fc679e8778aa4493a60d27c18a93dbf0.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_2adce281dc1a4e5fa7355c36ffefa946.pdf?index=trueIn PDF document text
    • http://tafiwepamubov.atwebpages.com/what_is_an_example_of_a_bilateral_contract.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_1f05707a24a04e10bdd04b494ddcaf04.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_ac9be6e3012e4ae2aae81e2260ad2e66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeponodij/patient_details_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/personification_worksheet_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/whatsapp_status_video_free_love.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/58339238658.pdfIn PDF document text
    • http://biburusig.myartsonline.com/used_fishman_sa220_for_sale.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_478f90d16e7241268ca7b4e48356147f.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_e8ae6337a9d2430ca1988b5f5ed8bc84.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_2d00b4da8aa34ad1a2e0b3ad511062eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/english_books_for_free_to_download.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_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 5520 bytes
SHA-256: 3ac106266b45f2c840d9738d358df44f6a8ed1e8f0cda2d093a3ff9efa0c39be
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 11800 bytes
SHA-256: c1cfca064a768d04bb558d8b77d8dd01641b06e012d9076ccab2ab72b5229ff2

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