Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0be6864254571a4…

MALICIOUS

PDF

81.1 KB Created: 2021-04-28 21:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 90238da76d62ea47449407bc17b86cc5 SHA-1: 4722ae07aca3926eb82bb1c7aad1b308358ddf0c SHA-256: c0be6864254571a4118a373dacb1982b529937b8e535d04528adf793b0e3f053
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://vilenefex.ru/strik?utm_term=how+to+use+combination+mode+in+lg+microwave', are used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=how+to+use+combination+mode+in+lg+microwave PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366628/normal_60393e1832f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_6033de810f6f4.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/ihidcgd/othello_sparknotes_act_2_scene_3.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/JhjcSif/toolbox_organization_board.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/hc7mgjD/febijizaxaloxudozu.pdfIn PDF document text
    • https://cdn.sqhk.co/bovavadas/EugeIjb/ruskin_fire_damper_installation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/WrTbhfv/wiziregomububulubebason.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/0hhhj5D/penikolejidoniwixobugoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60596ab908ca4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_0e66f4f181744b62aeff81957f257ad6.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_5255922c77964403b451bc286c43a05f.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ba89f16f193143fdaff1cf89fb1ac84d.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_f173f8ea1d464d1db735d0a58f6e32be.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_12a32a90938e4e8b9ab75b9d5d54937b.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_3bfb64abd6a742f1ac3b732d7f30aa12.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_4a98a55d79df4b5fb87d04a5b5884147.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_e93f159b71644d348867f51e7978a5de.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_e8390d13799d47aabe280b78b5fd18c7.pdf?index=trueIn 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_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 5512 bytes
SHA-256: e2717ca32be89c60a73a5cbf322ced5680866ecc3c76fdf6f20a0cd341888a95
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 11480 bytes
SHA-256: 2e8e9c3394c2b7a2600f6fb7eab122185d138bf6e3ee8fa33cff9c8917135e40