Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d677f6338fb2b9…

MALICIOUS

PDF

75.5 KB Created: 2020-11-14 10:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d147d60ed030f8e7edf1f7022ef16ddd SHA-1: 18bac1be189046d991edcbe69e8adbb40bfa3d29 SHA-256: 18d677f6338fb2b9a2b475a0659e836625e726266ef273b2dcf946820cf705c9
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate it's part of a link farm and has been flagged by a machine learning model as malicious. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/aws?utm_term=online+video+er+free+instagram In PDF document text
    • https://zanugikujo.weebly.com/uploads/1/3/4/3/134399251/23aa93c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f942152506a5.pdfIn PDF document text
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/76d506bc391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sojaxub/vaderewe.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/60242481580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b75144-d8ae-4968-ad3c-72dc29df350d/st_banjara_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb78c31f-b934-43fd-bf8a-a2509bd81182/346560116.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/cch_chuyn_i_file_sang_nh.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/calendar_template_blank_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a8d19c-778d-4b8a-8599-dda7435b8433/1649975710.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/midnight_special_song_year.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/40110274739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70cdbbbc-8283-4ba2-9f05-eb899f82592b/13571287862.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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 5312 bytes
SHA-256: 5792c758797be607bc8b3385608737a582ec446b6a87a5080c994746da359d0a
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 10748 bytes
SHA-256: e1509d1c68d01c0829888ccb17af1b075bb23ce1ac309140e41df88c1dbce128

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