Malicious PDF — malware analysis report

Static analysis result for SHA-256 6994e6d9e36d8681…

MALICIOUS

PDF

122.1 KB Created: 2021-03-05 23:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d583dbd3eb8c70fe52b47e034f7352d4 SHA-1: d97723ebc27b28944d65ebc9f1864d55fda92915 SHA-256: 6994e6d9e36d8681a1e414ff023e8ea881f5254bb5fa2a78dce8a89412ef8424
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

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://nipisod.ru/aws?utm_term=wireless+communication+technology PDF link annotation
    • https://xosipepimebat.weebly.com/uploads/1/3/2/6/132682768/xumewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450249/normal_600c8bfad6a47.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hh5Xjew/6328072742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_601b64ffeb57a.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/c582299a9faf8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_600cffe346193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5fe45d79bf00a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_6041045d67ba8.pdfIn PDF document text
    • https://tovumanaxi.weebly.com/uploads/1/3/5/3/135392352/9034756.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/ighejcn/xexewonoxenixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_601e64ecd3050.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/67c4d.pdfIn PDF document text
    • https://cdn.sqhk.co/bumajanivosi/ijeamvk/harvard_business_review_magazine_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5ffdd16bf187e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wizidimawag/36608601284.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/project_management_log_book_template.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_592abe9bbbf546468a94e53e45a357f2.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_8eaed8690b7342168d90f2f323897f35.pdf?index=trueIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_f17066f67513474ea1ba8a09236d818a.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_27247704f95b43efb650e12572b503aa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDC 5212 bytes
SHA-256: 712ccb809d60243589f04b9908dd0d1fc89d0f5bb7e9a058c1988b0757146cc0
font_01_sfnt_off0001a072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A072 13848 bytes
SHA-256: 4ebf1fed234179ff2259c3587e9e3b512f256f56c0a9d6a8dfbfcd4c0d805300
font_02_sfnt_off0001cc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC9A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2