Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d509f34cec757a3…

MALICIOUS

PDF

78.7 KB Created: 2021-06-10 07:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 17ad654785ed920938237e62648f757d SHA-1: c8c9f015ebeb455a1ff7af6982031468c0b6dcf8 SHA-256: 8d509f34cec757a3324315a3989e1a856948fe65bef5e197d7c88637349ac910
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution through these links. The embedded URLs point to potentially malicious or untrusted domains.

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://oniceh.ru/pbw?utm_term=annihilation+movie+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601f140dde665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486045/normal_5fee14b6c2e74.pdfIn PDF document text
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/gupobimo_gimavulafadamof_lavulisarikir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_60053e1ae9a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fd943d313b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_601672417591f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445892/normal_60590afed49a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_603e0e33b3f3f.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/4012373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd30e5833c2a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389805/normal_60b2d23069b65.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/derozosibazivu-salerisidowofok-mugit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_5fd7a84593a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_606b0af5b2da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_602873d34f2ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_600c8b4daa9d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144760026/how_to_export_tally_ledger_in_excel.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/logo_quiz_level_1_answers_cheats_solution.pdfIn PDF document text
    • http://povelin.pbworks.com/f/el_diario_de_greg_pelicula_completa_castellano.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144605250/33818784963.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_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 4876 bytes
SHA-256: 483e37e5534319d3f91cc9ff87688a25ba58f0bf591c94bb8625414c148495f8
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10916 bytes
SHA-256: 889a09852e3e60a671c22f391512e00109b4b49c682f4212d419aab0c6f3c8ff

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