Malicious PDF — malware analysis report

Static analysis result for SHA-256 7967306bd4a964a2…

MALICIOUS

PDF

80.8 KB Created: 2021-04-07 00:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 516cffe2a5ee30ada737233b8da5e752 SHA-1: 3fe06fd122a14bac599cec139ee802b0c65bcac0 SHA-256: 7967306bd4a964a2aab4470e04d29ffc55ab28737affc366a331412fe38eefd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver second-stage payloads or redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=motivation+letter+for+bursary+application+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486220/normal_6063740edfdee.pdfIn PDF document text
    • http://domsale.xyz/770274511367iw1s.pdfIn PDF document text
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/9953257.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/kovopal_guroburenipu.pdfIn PDF document text
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/4087d08a3.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/4038231.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/xijekefosuzezom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_606c95110ad97.pdfIn PDF document text
    • https://nobazivikiva.weebly.com/uploads/1/3/0/7/130776215/kimumiseposalo-nadapij-vumazusupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_6038f7e5e7b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_60385f4972d6d.pdfIn PDF document text
    • http://finansi-7.online/grammar_englishiy1g8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6023916995ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_60248815cf77d.pdfIn PDF document text
    • http://edaruzal.xyz/free_template_html5_one_pagekg0ti.pdfIn PDF document text
    • http://gatorama.space/40329864655h44go.pdfIn PDF document text
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/demarad-wijurolilufe.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/zopugatitov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_a1fc01a7fe054ba8b4ae118e8e11606b.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_7a1d6b256226415db22cd6a90a56d80a.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_4231ab2376f7488fa9ef8a56db3350c0.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_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 5456 bytes
SHA-256: c361f46d3d9d31a50fc3f3afea3617952aaec7fbb141ab642528e0f2ef80fde2
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 10632 bytes
SHA-256: 5828c2a806aad15909126314cce694e9aa96b776bf26bfd7f3c90c3238962da6