Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c6d5a13864c191…

MALICIOUS

PDF

70.6 KB Created: 2020-11-23 13:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 42a08ccaa208f3da68158e9efbabe025 SHA-1: d524efdac4a902924953fb6748cbe644aface9c5 SHA-256: 94c6d5a13864c1915d043d42fd57dbda33ddd923ce2ee957934ba0aa9d19bb31
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains like weebly.com, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest the primary purpose is to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://trafffi.ru/strik?utm_term=netsis+program%25C4%25B1+full+indir PDF link annotation
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/gujumawo.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/9f8672425e.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/4970297.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/9053817.pdfIn PDF document text
    • https://tepunejor.weebly.com/uploads/1/3/4/6/134636279/gizujumib_gosiru_gorudas_folezuriwarotug.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9c521.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/luvegarogizusuxukab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b91553a-cb8c-4c15-b4e4-a11a7b2b8c61/77267155855.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/kiduku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ecec2b-7e19-4705-a6d7-f3468f9fffe5/gakesaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01393f04-a711-4b15-864c-918ebd1a1bd6/wojaligu.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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 5364 bytes
SHA-256: d9abeccb5654dde9bf2fbde20a1d120fd8ed61f4d2d2dc49f5c1641db74b58e8
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 14100 bytes
SHA-256: ccae945b0ddee5366f8adef866763b476a80e531b6b9ad3b4cc0e5563426da4a

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