Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56e87ba6f3d9d53…

MALICIOUS

PDF

86.0 KB Created: 2021-03-22 16:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e0c296d8f5f2bd745a0e3860cb604cdf SHA-1: b1d902b3e73655d8332ab467c942dc6bad9ab60a SHA-256: b56e87ba6f3d9d5313e7ccc75f9ab096d6bdd6d1ba5f10982b5cdded0b1dad49
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. Although no scripts were extracted, the document's structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/award?keyword=website+als+pdf+speichern+mac In PDF document text
    • http://budivev.scienceontheweb.net/kaliziwonogijisak.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/99430652349.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/lufituxomura.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/0gcggjj/87452101398.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/iiEDjcJ/kivagakatusilexulubimeso.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/ronokokanurexe.pdfIn PDF document text
    • https://cdn.sqhk.co/ropesuzuruf/y266Sjc/zafobur.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/autocad_2020_tutorial_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jhoa91v/lamilovupopadameridex.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/gwZqMhb/21311202281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_72bd19dc897b46508fd3fa1223346e0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saxefi/pobabibologige.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/fixunij.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_46daacd8dafe4cffb66ae1fedfa1010e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/gipebusigatu.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_14b7f5cc8b71491db0b6e7f1f9617a27.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_8b8c62ceab864d3da8a2a28632cfd148.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_c38265b03df34a6c85d852ab0d1c1cda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/spelling_worksheets_for_grade_2_printable.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 5228 bytes
SHA-256: 60ebc314d44e60c75e47cd35508e761cbac4cd366eb9255dff45554507755aab
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 11696 bytes
SHA-256: 8f2899bbfb71e29d55eb7d5b911ea8235fa08fba94362edd6a8bbcf8b46581a7
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 16436 bytes
SHA-256: 672e4eff487b52c9ca0539e48b803941f86446360b7cdabb396aaadfb509c9f8
font_03_sfnt_off00013aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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