Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b230a4ae5fbba26…

MALICIOUS

PDF

77.5 KB Created: 2021-03-09 20:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7661ec2fcdba65ff3d1a720414559421 SHA-1: 311a66039966432607e02a7f3fc3b529d4b1a51e SHA-256: 4b230a4ae5fbba263ea2646d89ae5b1c1a8bc1c27fed5cf85c7d05d0568483d6
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with a primary URL pointing to a site that appears to be a lure for search engine traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful content.

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://botokaw.ru/strik?utm_term=how+to+connect+vizio+2.1+soundbar+to+roku+tv PDF link annotation
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/f2a0edae.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/fb74d.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/nojubeliso_faredakatowuma_vavexoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fdbdf0818001.pdfIn PDF document text
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/kogefik.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/e336e3af6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff9174ad0118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467560/normal_5fde65548c69e.pdfIn PDF document text
    • https://kabawerabava.weebly.com/uploads/1/3/0/7/130774965/174605.pdfIn PDF document text
    • https://tasusigogifu.weebly.com/uploads/1/3/5/3/135303518/5687070.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://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_c26b1078114c4bb0811a071fd9c29452.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df654d5e-ea7f-4cef-9a2b-e612c4a80aa6/62513700517.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/33238722668.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_1c2a4c142a654b94afc94c1ece491ae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0b712e-ff34-435e-95f5-1763bc25e3e6/wordly_wise_book_6_answer_key_online.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/65024890268.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/jukenabaweto.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_4dbc091fe6ff42e5ab09e50552d23fd0.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_243b8160b4a44a989aee5fedcebd033c.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_bb00b7e396f64059b5909cbb4a2b9ee1.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_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 5368 bytes
SHA-256: 7982fe606f77939476a0b6f52f52c1429221ba0f29005b7ba49a3e02ba8e966f
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10740 bytes
SHA-256: c67e8eb829cc6dbc0839783d4e451153846243bf5343a26ac6b180c4ea2612fa
font_02_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378