Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9b0b6e4f53f766…

MALICIOUS

PDF

78.6 KB Created: 2021-04-24 16:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c2042d82f28cfa5148a611bc45ea6634 SHA-1: 6ffa112e86fcf2953c376c35b674e08a0d6b56b7 SHA-256: 1f9b0b6e4f53f766542c5a462d64fab51205a981d80c85bd94443e616378c3c7
186 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

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://kuzutuzo.ru/strik?utm_term=is+the+fight+club+book+good PDF link annotation
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/4080771.pdfIn PDF document text
    • https://wirazalalotun.weebly.com/uploads/1/3/0/7/130776536/e1c99.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/eu_general_data_protection_regulation_levy_fine.pdfIn PDF document text
    • https://faranopiz.weebly.com/uploads/1/3/5/3/135332407/tewezovegekeba_lewoloruxulexo.pdfIn PDF document text
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/zunanib.pdfIn PDF document text
    • http://saudiautoinsurance.com/verbo_scrivere_alla_forma_passivand4dz.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/vuguxodeluvejatun.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/vodadavoxavikufexo.pdfIn PDF document text
    • http://gusebozaromurel.mypressonline.com/donexasurebiwutuluwofu.pdfIn PDF document text
    • http://sesalon.xyz/how_do_i_program_my_jumbo_universal_remote_to_my_tvo4z0s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_d6f7eff27cc444c0a59015c1912b2f42.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_31c190d42ea042a8bd1b758f4045fa6c.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_68e0d0556d3a4862ae21fd350d2410a0.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_911f63ab835c436eb683d6a2a9bf5ed8.pdf?index=trueIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_40bf5e9e9e384209926cca71b6359f5e.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_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 5116 bytes
SHA-256: 374d0a8655017367250f0cf82933ec56e67d8c9aa999004f7bf194835459ebd3
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 10792 bytes
SHA-256: ac4ed83f5f990297d2b66eb3d47c54c8d2991e41e2878a7dc20cdac57366bf28

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