Malicious PDF — malware analysis report

Static analysis result for SHA-256 39066289f1914c50…

MALICIOUS

PDF

69.5 KB Created: 2020-11-17 12:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f43fcbe9a0a0c505b56f3ae1d6ddaac0 SHA-1: 2deae6e96adde3614481e3987654b1c6220c3a05 SHA-256: 39066289f1914c508b754709296b501c3a7124337a76e6ac6a4460e3845aaf27
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/aws?utm_term=stagecoach+guided+bus+b+timetable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5f9a7afd22d2c.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/4318541.pdfIn PDF document text
    • https://kawewadibuporak.weebly.com/uploads/1/3/4/3/134371142/559380114d.pdfIn PDF document text
    • https://terurudib.weebly.com/uploads/1/3/4/3/134381327/9dd7038da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f9b7e118dc2a.pdfIn PDF document text
    • https://fuvibopozu.weebly.com/uploads/1/3/4/3/134373007/c3b59de22763f6d.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/3d5310a034.pdfIn PDF document text
    • https://mipurilor.weebly.com/uploads/1/3/1/0/131071035/9c1c53b5a64f7.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/vixuwogetiv/watch_frozen_2_online_123movies_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/furafagifisowibik.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/chompy_bird_kill_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/jesse_livermore_sit_tight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed181fe-5dff-4bcb-b0a5-c8b255dd2f05/40906022049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1048923f-1a23-434a-951e-c715b4453b80/treasure_map_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 5500 bytes
SHA-256: 6719b2cff11212c7070167644aa97275f29112565cac60b20c8d4ba05bf6bd44
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10844 bytes
SHA-256: f21dc1c1d300b38beb93e9133eb550415e854554f51dba4f462a429248d484aa